Ontario Highway 401
Highway 401 within Ontario, Canada
|Maintained by the Ministry of Transportation of Ontario|
|Length:||817.9 km[a] (508.2 mi)|
|West end:||Highway 3 to Windsor|
|East end:||A-20 towards Montreal, QC|
|Major cities:||Windsor, London, Kitchener, Mississauga, Toronto, Oshawa, Kingston and Cornwall|
King's Highway 401, also known by its official name as the Macdonald–Cartier Freeway and colloquially as the four-oh-one, is a 400-series highway in the Canadian province of Ontario stretching 817.9 kilometres (508.2 mi) from Windsor to the Quebec border. The segment of Highway 401 passing through Toronto is the busiest highway in North America, and one of the widest and busiest in the world. Together with Quebec Autoroute 20, it forms the road transportation backbone of the Quebec City–Windsor Corridor, along which over half of Canada's population resides. The entire route is maintained by the Ministry of Transportation of Ontario (MTO) and patrolled by the Ontario Provincial Police. The posted speed limit is 100 km/h (62 mph) throughout its length.
Three individual highways were renumbered "Highway 401" by the end of 1952: the partially completed Toronto Bypass between Weston Road and Highway 11 (Yonge Street); Highway 2A between West Hill and Newcastle; and the Scenic Highway between Gananoque and Brockville, now known as the Thousand Islands Parkway. These three sections of highway were 11.8 km (7.3 mi), 54.7 km (34.0 mi) and 41.2 km (25.6 mi) long, respectively, at the time of their assumption to provincial highway status. Highway 401 became fully navigable from Windsor to the Quebec border in 1964. The following year, it was given a second designation, the Macdonald–Cartier Freeway, in honour of the fathers of Confederation. By the end of 1968, the Gananoque–Brockville section was bypassed and the final intersection grade-separated near Kingston, making Highway 401 a freeway for its entire 817.9-km length. On August 24, 2007, the portion of the highway between Glen Miller Road in Trenton and the Don Valley Parkway / Highway 404 Junction in Toronto was designated the Highway of Heroes, as the road is travelled by funeral convoys for fallen Canadian Forces personnel from CFB Trenton to the coroner's office in Toronto.
In 2011 construction began on a westward extension of Highway 401 that will be known as the Right Honourable Herb Gray Parkway. This new route will generally follow, but not replace, former Highway 3 between the current end of the freeway and the E. C. Row Expressway, at which point it will turn and follow that route to the Detroit River International Crossing.
Elsewhere in Ontario, plans are underway to widen the remaining four lane sections between Windsor and London to six lanes and to widen the route between Cambridge and Milton as well as through Oshawa. The expansive twelve-plus lane collector–express system will also be extended west through Mississauga to Milton and east through Ajax and Whitby.
Route description 
Highway 401 extends across Southwestern, Central and Eastern Ontario. In anticipation of the future expansion of the highway, the transportation ministry purchased a 91.4-metre-wide (300 ft) right-of-way along the entire length. Generally the highway occupies only a portion of this allotment. It is one of the world's busiest highways; a 2008 analysis stated that the annual average daily traffic (AADT) count between Weston Road and Highway 400 in Toronto was approximately 450,000, while a second study estimates that over 500,000 vehicles travel that section on some days. This makes it the busiest roadway in North America, surpassing the Santa Monica Freeway in Los Angeles and I-75 in Atlanta. The just-in-time auto parts delivery systems of the highly integrated automobile industry of Michigan and Ontario have contributed to the highway's status as the busiest truck route in the world, carrying 60 percent of vehicular trade between Canada and the US.
Highway 401 also features the busiest multi-structure bridge in North America, located at Hogg's Hollow in Toronto. The four bridges, two for each direction with the collector and express lanes, carried an average of 373,700 vehicles daily in 2006. The highway is one of the major backbones of a network in the Great Lakes region, connecting the populous Quebec City – Windsor corridor with Michigan, New York and central Ontario's cottage country. It is the principal connection between Toronto and Montreal, becoming Autoroute 20 at the Quebec border.
Southwestern Ontario 
Though Highway 401 does not physically extend the last few kilometres to Detroit,[a] a proposed Windsor–Detroit border crossing may result in Highway 401 being extended to the Canada–United States border as early as 2013. At present, Highway 401 begins at Huron Church Road (formerly Highway 3) in Windsor, with four lanes diverging north and leaving Talbot Road (Highway 3) at Howard Avenue. At the Dougall Parkway, the highway turns east, widens to six lanes and exits Windsor. From here, Highway 401 mostly parallels the former route of Highway 98 from Windsor to Tilbury.
The topography in southwestern Ontario is flat and the land use primarily agricultural, taking advantage of the fertile clay soil deposited throughout the region. The primary river through the region is the Thames River, which drains the second largest watershed in southern Ontario and largely influences the land use surrounding the highway; It parallels the route to the north between Tilbury and Woodstock.
Near Tilbury, the highway loses its tall wall median barrier and narrows to four lanes, following lot lines laid between concession roads in a plan designed to limit damage to the sensitive agricultural lands through which the highway runs. Due to fatigue caused by the highway's flat and straight route, the section of Highway 401 from Windsor to London (especially west of Tilbury) has become known for deadly car accidents and pile-ups, earning it the nickname Carnage Alley. As the highway approaches London, Highway 402 merges in, resulting in a six-lane cross-section. Within London, it intersects the city's two municipal expressways, Highbury Avenue and the Veterans Memorial Parkway.
The section between London and Woodstock generally parallels the former Highway 2 but lies on the south side of the Thames River. While the topography in this area is less flat, the highway is generally straight. This part of Highway 401 often experiences heavy snowsqualls in early winter, sometimes extending as far east as Toronto. To the south of Woodstock, Highway 401 curves northeast and encounters the western terminus of Highway 403. The highway heads towards Kitchener and Cambridge, where it encounters Highway 8 and returns to its eastward orientation. East of Kitchener, the highway meanders towards Milton, passing through hills and cut rock along the way.
Greater Toronto Area 
As Highway 401 approaches the Greater Toronto Area (GTA), it descends through the ecologically protected Niagara Escarpment to the west of Milton. Upon entering the town, it enters the first urbanized section of the GTA, passing through two rural areas between there and Oshawa. The first rural gap is the western side of Toronto's Greenbelt, a zone around Toronto protected from development. After this 10 km (6.2 mi) gap, the highway interchanges with the Highway 407 Express Toll Route. Within the GTA, the highway passes several major shopping malls including Yorkdale Shopping Centre, Scarborough Town Centre and Pickering Town Centre.
Highway 401 widens into a collector-express system as it approaches the junction with Highway 403 and Highway 410 in Mississauga, a concept inspired by the Dan Ryan Expressway in Chicago. The system divides each direction of travel into collector and express lanes, giving the highway a wide span and four carriageways. To avoid confusion between carriageways, blue signs are used for the collector lanes and green signs for the express lanes. Unlike the collector lanes, which provide access to every interchange, the express lanes only provide direct access to a select few interchanges. Access between the two is provided by transfers, which are strategically placed to prevent disruptions caused by closely spaced interchanges. The overall purpose of the collector-express system is to maximize traffic flow for both local and long-distance traffic. In addition, Highway 401 was equipped with a traffic camera system called COMPASS in early 1991. Using closed-circuit television cameras, vehicle detection loops and LED changeable-message signs, COMPASS enables the MTO Traffic Operations Centre to obtain a real-time assessment of traffic conditions and alert drivers of collisions, congestion and construction. The system currently stretches from the Highway 403 / 410 interchange in Mississauga to Harwood Avenue in Ajax.
Two sets of collector-express systems exist in the GTA. The first set is 6.6 km (4.1 mi) long and connects Highway 403, Highway 410 and Highway 427. This system primarily serves to accommodate and organize various traffic movements from the Highway 403 / 410 and Highway 427 interchanges along Highway 401, replacing an earlier plan that would have run Highway 403 directly to Eglinton Avenue and the never-built Richview Expressway. East of the interchange with Renforth Drive, the collector lanes diverge to become the on-ramps to Highway 27, 427 and Eglinton Avenue. The second 43.7 km (27.2 mi) system passes through the centre of Toronto and ends in Pickering to the east. The 5 km (3.1 mi) gap between the two systems is a traffic bottleneck. However, the interchange cannot currently accommodate future widening of Highway 401.
Highway 401 widens to 18 lanes south of Toronto Pearson International Airport. Progressing eastward, eight lanes are carried beneath the large spaghetti junction at Highway 427. The highway curves northeast and follows a power transmission corridor to Highway 409, which merges with the mainline and forms the collector lanes. It returns to its eastward route through Toronto, now carrying 12–16 lanes of traffic on four carriageways. Highway 401 is often congested in this section, with an average of 442,900 vehicles passing between Weston Road and Highway 400 per day as of 2008. In spite of this congestion, it is the primary commuting route in Toronto; over 50 percent of vehicles bound for downtown Toronto use the highway.
East of Highway 400 is The Basketweave, a criss-crossing transfer between the express and collectors carriageways, beyond which is Yorkdale Mall. Twelve lanes pass beneath a complicated interchange with Allen Road, built to serve the cancelled Spadina Expressway. Further east, the highway crosses Hogg's Hollow, over the West Don River and Yonge Street in the centre of Toronto. It then crosses the East Don River and climbs toward the Don Valley Parkway, which provides access to downtown Toronto and Highway 404, which provides access to the suburbs to the north. Progressing eastward, the highway continues through mostly residential areas in Scarborough, eventually reaching the Rouge Valley on the city's eastern edge and crossing into Pickering.
West of Pickering, Highway 401 again meets former Highway 2, which thereafter parallels it to the Quebec border. As the highway approaches Brock Road in Pickering, the collector and express lanes converge, narrowing the 14-lane cross-section to 10, divided only at the centre. It remains this width as it passes into Ajax, before narrowing back to six lanes at Salem Road.
East of Ajax, the highway passes through the second 3.5 km (2.1 mi) rural gap, and enters Whitby. The stretch of Highway 401 through Whitby and Oshawa features several structures completed during the initial construction of the highway in the 1940s. Several of these structures are to be demolished, either due to their age, or to prepare for the planned widening of Highway 401 through this area. A former Canadian National Railway overpass, which was fenced off but commonly used by pedestrians during Highway of Heroes repatriations, was demolished on the night of June 11, 2011. A second structure in Bowmanville was demolished during two overnight closures on July 9 and July 16. At Harmony Road, the suburban surroundings quickly transition to agricultural land. The highway curves around the south side of Bowmanville and travels towards Highway 35 and Highway 115.
Eastern Ontario 
From east of Highway 35 and Highway 115 to Cobourg, Highway 401 passes through a mix of agricultural land and forests, maintaining a straight course. As the highway passes through Cobourg, it narrows to four lanes and the terrain becomes undulating, with the highway routed around hills and through valleys along the shores of Lake Ontario. At Trenton, the highway crosses the Trent Canal and returns to an agricultural setting. It then crosses the Moira River as it goes through Belleville before heading eastward to Kingston. The Kingston portion of the highway, originally named the Kingston-Bypass, was one of the first sections of the highway to be completed; it is now mostly three lanes each way.
East of Kingston, the highway continues through a predominantly agricultural area alongside the Saint Lawrence River to Gananoque, where it splits with the Thousand Islands Parkway. The current Highway 401 runs parallel to the parkway several kilometres inland from the river. The Canadian Shield, an ancient geological formation, appears through this heavily forested section of the highway. Highway 401 rejoins the Thousand Islands Parkway immediately southwest of Brockville, now heading northeast.
The remainder of the highway runs parallel to the former Highway 2 along the shore of the Saint Lawrence River within the Saint Lawrence Valley. Northeast of Brockville is the interchange with Highway 416, which heads north towards Ottawa. At the Quebec border, Highway 401 becomes Autoroute 20 and continues to Montreal.
|Section||Dougall Parkway –
Essex County Road 46
|Highbury Avenue –
Veterans Memorial Parkway
|Oxford County Road 59 –
|Highway 8 –
|Mississauga Road –
|Weston Road –
|Park Road –
|Highway 62 –
|Frontenac County Road 38 –
|Highway 29 –
North Augusta Road
|Highway 138 –
|Traffic volume (AADT)||1969||9,550||17,450||16,700||19,900||28,450||106,850||29,000||13,750||12,000||10,050||10,300|
|Average annual daily traffic counts of selected sections of Highway 401 over 40 years|
|Location||Highway 3 to Dougall Parkway||Dougall Parkway to Essex County Road 42||Essex County Road 42 to Highway 402||Highway 402 to Highway 403 / 410||Highway 403 / 410 to Highway 427||Highway 427 to Highway 27||Highway 27 to Highway 409||Highway 409 to Brock Road||Brock Road to Salem Road||Salem Road to Burnham Street||Burnham Street to Frontenac County Road 38||Frontenac County Road 38 to Montreal Street||Montreal Street to Quebec border|
|Lane count||4 lanes||6 lanes||4 lanes||6 lanes||18-lane collector-express system||8 lanes||10 lanes||12–16-lane collector-express system||10 lanes||6 lanes||4 lanes||6 lanes||4 lanes|
|Distance||2.5 km (1.6 mi)||43.1 km (26.8 mi)||127.5 km (79.2 mi)||161.3 km (100.2 mi)||5.8 km (3.6 mi)||0.8 km (0.50 mi)||3.9 km (2.4 mi)||43.3 km (26.9 mi)||6.0 km (3.7 mi)||68.3 km (42.4 mi)||138.2 km (85.9 mi)||8.2 km (5.1 mi)||209.0 km (129.9 mi)|
|Number of through lanes on Highway 401 (excludes ongoing or planned widening projects)|
Highway 401's history predates its designation by over two decades. As automobile use in southern Ontario grew in the early 20th century, road design and construction advanced significantly. Following frequent erosion of Lake Shore Road, then macadamized, a cement road known as the Toronto–Hamilton Highway was proposed in January 1914. Construction began on November 8 of that year, following the onset of World War I. The highway was designed to run along the lake shore, instead of Dundas Street to the north, because the numerous hills encountered along Dundas would have increased costs without improving accessibility. Middle Road, a dirt lane named because of its position between the two, was not considered since Lake Shore and Dundas were both overcrowded and in need of serious repairs. The road was formally opened on November 24, 1917, 5.5 m (18 ft) wide and nearly 64 km (40 mi) long. It was the first concrete road in Ontario, as well as one of the longest stretches of concrete road between two cities in the world.
Over the next decade, vehicle usage increased substantially, and by 1920 Lakeshore Road was again congested, particularly during weekends. In response, the Department of Highways examined improving another road between Toronto and Hamilton. The road was to be more than twice the width of Lakeshore Road at 12 m (39 ft) and would carry two lanes of traffic in either direction. Construction on what was then known as the Queen Street Extension west of Toronto began in early 1931.
Before the highway could be completed, Thomas McQuesten was appointed the new minister of the Department of Highways, with Robert Melville Smith as deputy minister, following the 1934 provincial elections. Smith, inspired by the German autobahns — new "dual-lane divided highways" — modified the design for Ontario roads, and McQuesten ordered that the Middle Road be converted into this new form of highway. A 40 m (130 ft) right-of-way was purchased along the Middle Road and construction began to convert the existing sections to a divided highway. Work also began on Canada's first interchange at Highway 10.
Beginning in 1935, McQuesten applied the concept of a dual-highway to several projects along Highway 2, including along Kingston Road in Scarborough Township. When widening in Scarborough reached the Highland Creek ravine in 1936, the Department of Highways began construction on a new bridge over the large valley, bypassing the former alignment around West Hill. From here the highway was constructed on a new alignment to Oshawa, avoiding construction on the congested Highway 2. As grading and bridge construction neared completion on the new highway between West Hill and Oshawa in September 1939, World War II broke out and gradually tax revenues were re-allocated from highway construction to the war effort.
At the same time, between September 6 and 8, 1939, the Ontario Good Roads Association Conference was held at Bigwin Inn, near Huntsville, drawing highway engineers from across North America to discuss the new concept of "Dual Highways". On the first day of the convention, McQuesten announced his vision of the freeway: an uninterrupted drive through the scenic regions of Ontario, discouraging local business and local traffic from accessing the highway except at infrequent controlled-access points. It was announced in the days thereafter that this concept would be applied to a new "trans-provincial expressway", running from Windsor to the Quebec border.
Highway engineers evaluated factors such as grading, curve radius and the narrow median used along the Middle Road (which was inaugurated on August 23, 1940, as the Queen Elizabeth Way), and began to plan the course of a new dual highway mostly parallel to Highway 2, with precedence given to areas most hampered by congestion. Unlike the Queen Elizabeth Way (QEW), this highway would not be built along an existing road, but rather on a new right-of-way, avoiding the need to provide access to properties.
Along with immense improvements to machinery and construction techniques over its six-year course, the war provided planners an opportunity to conduct a survey of 375,000 drivers, asking them about their preferred route to travel to their destination. Using this information, a course was plotted from Windsor to Quebec, bypassing all towns along the way.
Highway 2S (S for Scenic), was the first completed section of new roadway. Built to connect with the Thousand Islands Bridge at Ivy Lea and opened as a gravel road in late 1941 or early 1942, the road followed the shore of the Saint Lawrence River and connected with the western end of the twinned Highway 2 near Brockville. In addition, the highway between Highland Creek and Oshawa was opened as a gravel-surfaced road in May 1942.
Following the war, construction resumed on roadways throughout Ontario. The expressway between Highland Creek and Oshawa was completed in December 1947, while other sections languished. The Toronto–Barrie Highway was the primary focus of the Department of Highways at the time, and the onset of the Korean War in 1950 stalled construction again. Despite the delays, highway minister George Doucett officially announced the plans for construction of the new trans-provincial expressway that year, with the Toronto to Oshawa expressway serving as a model for the design. Work on the most important link, the Toronto Bypass, began in 1951, but it would not open with that name.
In July 1952 (possibly July 1, the same day Highway 400 was numbered),[b] the Highland Creek to Oshawa expressway and Highway 2S were designated Controlled-Access Highway No 401, a move scorned by one critic because of the lack of thought into the numbered name. Construction was completed for several sections of the Toronto Bypass; between Highway 400 and Dufferin Street in August, west to Weston Road in September, east to Bathurst Street in October and finally to Yonge Street in December. Extensions east and west began in 1953; the eastern extension to Bayview Avenue would open in April 1955, the western extension was delayed by the damage caused by Hurricane Hazel on October 15, 1954, which nearly destroyed the new bridge over the Humber River. The reconstruction would take until July 8, 1955, and the highway was opened between Weston and Highway 27 in September 1955.
The entire bypass, including the widening of Highway 27 into an expressway south of Highway 401, was completed in August 1956. Upon its opening, the bypass was described by one reporter as "a motorist's dream" providing "some of the most soothing scenery in the Metropolitan area". The reporter continued, with regard to the eastern section through Scarborough, that it "winds smoothly through pastures across streams and rivers, and beside green thickets. It seems a long way from the big city." By 1959 however, the bypass was a lineup of cars, as 85,000 drivers crowded the roadway, designed to handle a maximum of 48,000 vehicles, on a daily basis. Motorists found the new road to be a convenient way of travelling across Toronto; this convenience helped influence the suburban shift in the city and continues to be a driving force of urban sprawl today.
Meanwhile, beyond Toronto, the highway was being built in a patchwork fashion, focusing on congested areas first. Construction west from Highway 27 began in late 1954, as did the Kingston Bypass in Eastern Ontario. Work began to connect the latter with the Scenic Highway in 1955. By 1956, construction had begun on the segment between Highway 4 in London and Highway 2 in Woodstock, as well as on the section between Windsor and Tilbury.
In 1958, a section bypassing Morrisburg was opened to accommodate traffic displaced from a portion of Highway 2 through The Lost Villages of the Saint Lawrence Seaway. Highway 2 would ultimately be reopened on a new alignment which followed the CN rail right-of-way.
By the end of 1960, the Toronto section of the highway was extended both eastwards and westwards: first, to the east between Newcastle and Port Hope on June 30, then later to the west between Highway 25 in Milton and Highway 8 south of Kitchener on November 17. By mid-1961, the section between Brighton and Marysville had opened. The gap to the east, from Highway 28 in Port Hope to Highway 30 in Brighton was opened on July 20, 1961.
The gap between Woodstock and Kitchener was completed on November 9, 1961, while the gap between Tilbury and London was completed two lanes at a time; the northbound lanes on October 22, 1963, the southbound on July 20, 1965. The gap between Marysville and Kingston was opened by 1962. The final sections, from west of Cornwall to Lancaster, were opened between 1962 and 1964; two lanes opened to Lancaster on September 11, 1962, but the other two were not completed until July 31, 1964. The last segment, to the Quebec border, was opened on November 10, 1964. Finally, on October 11, 1968, the Thousand Islands Bypass opened. This final piece was commemorated with a plaque to signify the completion of Highway 401.
In Toronto, engineers and surveyors were examining the four-lane bypass, while planners set about designing a way to handle the commuter highway. In 1963, transportation minister Charles MacNaughton announced the widening of Highway 401 in Toronto from four to a minimum of 12 lanes between Islington Avenue and Markham Road. The design was taken from the Dan Ryan Expressway in Chicago, which was widened into a similar configuration around the same time. Construction began immediately. While the plan initially called for construction to end in 1967, it continued for nearly a decade. At least four lanes were always open during the large reconstruction project, which included complex new interchanges at Highway 27, Highway 400, the planned Spadina Expressway and the Don Valley Parkway. The system was completed in 1972, along with the Highway 27 bypass north of Highway 401. Most of the interchanges in Toronto were reconstructed as partial cloverleafs and a continuous lighting system was installed.
On January 11, 1965, at the dinner celebration of Sir John A. Macdonald's 150th birthday, John Robarts designated Highway 401 the Macdonald–Cartier Freeway to honour Macdonald and George-Étienne Cartier, two of Canada's Fathers of Confederation. Unlike other names later applied to the highway, the Macdonald–Cartier Freeway designation covers the entire length of Highway 401. Signs designating the freeway and shields with the letters 'M-C' were installed, but these had been removed by 1997. In 2003, 38 years after Robarts' naming of the highway, a Member of Provincial Parliament attempted to get the Macdonald-Cartier Freeway highway name enshrined into law; the bill only passed first reading and was not enacted.
In the 1970s, Highway 401 was widened to six lanes in Durham, but otherwise saw little improvement. The 1980s saw more sections widened, as well as a new collector-express system between Highway 403 / 410 and Highway 427 completed in mid-1985. Plans were made to extend the eastern system from Neilson Road to Brock Road in Pickering in the late 1980s, but took over a decade to reach fruition by 2000. This was followed shortly thereafter by the widening of the highway through Ajax and a new interchange at Pickering Beach Road (renamed Salem Road) and Stevenson Road.
The 1990s also saw the first step in widening the highway to six lanes from Toronto to London. A project in the mid-1990s brought the highway up to a minimum of six lanes between Highway 8 in Kitchener and Highway 35 / 115 in Newcastle. Other projects prepared sections for eventual widening.
In 1993, the stretch of Highway 401 eastbound near Milton and westbound near Whitby had chevrons painted in each lane in an effort to reduce tailgating, a concept borrowed from France and Britain. Signs advised motorists to keep at least two chevrons apart, in essence warning them not to follow too closely. Some of these chevrons remain intact in the westbound lanes in Whitby, though the signs stating their use have since been removed.
Beginning in 1998, several projects were initiated on Highway 401 within Toronto. These included the addition of one lane through the Highway 427 interchange in 2005, as well as the resurfacing of the pavement through the city.
Advantage I-75 
Between June 1990 and 1998, Highway 401 and Interstate 75 were used for a pilot project named Advantage I-75 to test the reliability and versatility of an automated tracking system for transport trucks. Termed MACS for Mainline Automated Clearance System, it would allow a truck to travel from Florida to Ontario without a second inspection. MACS was initially tested out at two truck inspection stations in Kentucky, with transponders installed in 220 trucks. Exact time, date, location, weight and axle data were logged as a truck approached an equipped station. Following initial tests, MACS was deployed at every inspection station along I-75 from Miami to Detroit and along Highway 401 from Windsor to Belleville in 1994. The project demonstrated the effectiveness of electronic systems in enforcing freight restrictions without delaying vehicles, while alleviating security fears that such systems could be easily compromised. The concept has since been applied to many parts of Canada, including Highway 407's electronic tolling system.
"Carnage Alley" 
The section of Highway 401 between Windsor and London has often been referred to as Carnage Alley, in reference to the numerous accidents that have occurred throughout its history. The term became more commonplace following several deadly pileups during the 1990s. The narrow and open grass median was an ineffective obstacle in preventing cross-median collisions. The soft shoulders consisted of gravel with a sharp slope which was blamed for facilitating vehicle rollovers. The nature of that section of highway, described as largely a straight road with a featureless agricultural landscape, was said to make drivers feel less involved and lose focus on the road. Several accidents resulted from motorists deviating from their lane and losing control of their vehicles.
Various other names, including The Killer Highway circulated for a time, but Carnage Alley became predominant following an 87-vehicle pile-up on September 3, 1999 (the start of Labour Day weekend), the worst in Canadian history, that resulted in eight deaths and 45 injured individuals.
Only a few days prior, then-Transportation Minister David Turnbull had deemed the highway "pleasant" to drive. On the morning of September 3, the local weather station reported clear conditions due to a malfunction, while a thick layer of fog rolled onto the highway. Dozens of vehicles including several semi-trailers quickly crashed into each other shortly after 8 a.m., one following another in the dense fog, and the accumulating wreckage caught traffic traveling in the opposite direction. Immediately following the accident, the MTO installed paved shoulders with rumble strips and funded additional police to patrol the highway, a move criticized as being insufficient.
Beginning in 2004, 46 km (29 mi) of the highway was widened from four asphalt lanes to six concrete lanes, paved shoulders were added, a concrete Ontario Tall Wall median was installed, which was the solution that the Canadian Automobile Association promoted in 1999. Interchanges were improved and signage was upgraded as part of a five-phase project to improve Highway 401 from Highway 3 in Windsor to Essex County Road 42 (formerly Highway 2) on the western edge of Tilbury.
Highway of Heroes 
On August 24, 2007, the MTO announced that the stretch of Highway 401 between Glen Miller Road in Trenton and the intersection of the Don Valley Parkway and Highway 404 in Toronto would bear the additional name Highway of Heroes, in honour of Canadian soldiers who have died, though Highway 401 in its entirety remains designated as the Macdonald–Cartier Freeway. This length of the highway is often travelled by a convoy of vehicles carrying a fallen soldier's body, with his or her family, from CFB Trenton to the coroner's office at the Centre for Forensic Sciences in Toronto. Since 2002, when the first fallen Canadian soldiers were repatriated from Afghanistan, crowds have lined the overpasses to pay their respects as convoys pass.
The origin of the name can be traced to a June 23, 2007 article in the Toronto Sun by columnist Joe Warmington, in which he interviewed Northumberland photographer Pete Fisher. Fisher, along with Bob Jenkins, an emergency dispatcher, were responsible for organizing the first bridge salutes following the loss of four soldiers on April 18, 2002. Warmington described the gathering of crowds on overpasses to welcome fallen soldiers as a "highway of heroes phenomena". This led a Crahame Township volunteer firefighter to contact Fisher on July 10 about starting a petition, leading Fisher to publish an article which was posted to the Northumberland Today website. The online article eventually caught the attention of London resident Jay Forbes. Forbes began a petition, which received over 20,000 signatures before being brought to the Minister of Transportation on August 22. Following the announcement on August 24, the provincial government and MTO set out to design new signs. The signs were erected and unveiled on September 7, and include a smaller reassurance marker (shield), as well as a larger billboard version.
Since 2008 
On August 10, 2008, following a series of explosions at a propane facility in Toronto, Highway 401 was closed between Highway 400 and Highway 404 as a precautionary measure, the largest closure of the highway in its history. The highway remained closed until 8 p.m., though several exits near the blast remained closed thereafter.
Between 2006 and 2008, Highway 401 was widened from four to six lanes between Highway 402 and Wellington Road in London. This included replacing the original Wellington Road overpass. In Oshawa, Exit 416 (Park Road) was replaced by a new interchange at Exit 415 (Stevenson Road). The contract, which began September 7, 2005, included the interchange and the resurfacing of 23.4 km (14.5 mi) of the highway between Oshawa and Highway 35 / Highway 115. The westbound ramps were opened in mid-September 2007 and the eastbound ramps in mid-2009. The resurfacing was completed mid-2010.
In November 2010, the widening of Highway 401 from four to six lanes between Woodstock and Kitchener was completed after many years of planning and construction. The project included the installation of a tall-wall median barrier, straightening curves and adding additional interchanges on the freeway, allowing it to be easily vacated in an emergency event.
The MTO intends to widen all of the remaining four-lane sections to a minimum of six.
Windsor–Essex Parkway 
In 2004, a joint announcement by the federal government of the United States and Government of Canada that a new border crossing would be constructed between Detroit and Windsor. The Detroit River International Crossing (DRIC) was formed as a bi-national committee to manage the project. The MTO took advantage of this opportunity to extend Highway 401 to the international border and began an environmental assessment on the entire project in late 2005. The City of Windsor also hired New York traffic consultant Sam Schwartz to design a parkway to the border. Schwartz's proposal would eventually inspire the DRIC's own design, but his route was not chosen, with the DRIC opting instead to take a northern route. On February 8, 2008, the MTO announced that it had begun purchasing property south of the E. C. Row Expressway, upsetting many area residents who had purchased properties in the years prior.
On March 3, 2008, the Michigan Department of Transportation and the MTO (in partnership with Transport Canada, the Federal Highway Administration of the United States and the Detroit River International Crossing group) completed a joint assessment on the soils along the Detroit River and determined that they could indeed support the weight of a new bridge; the stability of the underlying soil and clay and the impact of the nearby Windsor Salt Mine had caused concern for all parties involved in the project.
Despite protest from area residents, as well as a dismissed lawsuit from Ambassador Bridge owner Matty Moroun, it was announced on May 1, 2008, that a preferred route had been selected and that the new route would be named the Windsor–Essex Parkway. The new parkway will be below-grade and have six through-lanes. It will follow (but not replace) Talbot Road and Huron Church Road from a new interchange at the current end of Highway 401 to the E. C. Row Expressway, where it will run concurrently westward for 2 km (1.2 mi). From there, it will turn northwest and follow a new alignment to the border. Initial construction of a noise barrier from North Talbot Road to Howard Avenue began in March 2010. Two new bridges south of the current Highway 3 / 401 junction are also under construction. Full construction has begun as of August 18 2011, with an expected completion date of 2013 for the first phase of the project.
On November 28, 2012, the Ministry of Transportation announced that a Federal Order-in-Council was passed to change the name of the parkway to the Right Honourable Herb Gray Parkway, after the long-time Windsor MP.
Southwestern Ontario 
In Southwestern Ontario, several improvements are under way to provide six lanes on Highway 401 from Windsor to Toronto, in response to the Carnage Alley pile-up in 1999. West of Manning Road, the highway is being widened in anticipation of the Windsor–Essex Parkway. Between Tilbury and Highway 402, the highway remains four lanes wide with a grass median. The widening and upgrading of this section is in the planning stages, with construction possibly beginning in 2017 and lasting for several years. Several interchanges are slated to be upgraded as part of this construction.
Within the London area, traffic volumes are expected to increase considerably, leading to poor highway conditions. The province has put in place an extensive plan to widen and reconstruct the London corridor between 2006 and 2021. This includes building a new interchange with Wonderland Road to help improve access to Highway 401 westbound from the city's southwest end. This may also include partial interchanges along White Oak Road with Highways 401 and 402. This project will coincide with reconstructing the outdated cloverleaf interchange at Colonel Talbot Road and widening Highway 401 from four to six lanes between Highway 4 and Highway 402. Construction on the Wonderland Road interchange will start in 2013, with the rest of the projects beginning in 2015 and finishing in 2016. In addition, an environmental assessment is underway to examine the impact of reconstructing the three-way trumpet interchange with the Veterans Memorial Parkway into a four-way interchange in order to extend the expressway south of Highway 401. The MTO is also planning on widening Highway 401 from six to eight lanes through part of the London corridor.
Long term plans call for Highway 401 in the Waterloo region to be widened to eight lanes as well. The interchange between Highway 401 and Highway 8 (King Street) is to be reconstructed to make it free-flowing for all directions of travel.
Central Ontario 
In its 2007 plan for southern Ontario, the MTO announced long-term plans to create high-occupancy vehicle (HOV) lanes from Mississauga Road west to Milton; these plans have since been expanded in scope to as far west as Hespeler Road in Cambridge.
Construction is also underway to widen Highway 401 to a collector-express system from Highway 403 and Highway 410 west to Hurontario Street, a distance of 2.8 km (1.7 mi).
Within Toronto, some projects will be completed during overnight construction projects, including the widening and rehabilitation of the Hogg's Hollow bridge, the replacement of the original gantries throughout the collector-express system, and reconstructing the Highway 401 / 400 interchange.
Current expansion plans in Durham include the construction of two new freeways north from Highway 401. The first will be directly east of Lakeridge Road, while the second will lie to the east of Courtice Road. Alongside the extension of Highway 407, Highway 401 will be widened to 12 lanes, forming an extension to the current collector-express system, from its current end at Brock Road in Pickering to Durham Regional Highway 12 (Brock Street) in Whitby. In addition, Lakeridge Road will also feature a partial interchange with westbound entrance and eastbound exit ramps, with realignment on having Highway 401 shifted north and Lakeridge Road shifting west, to accommondate a new bridge and its ramps. Long term plans also call for HOV lanes to run from Brock Road to Harmony Road, though no planning has commenced.
Eastern Ontario 
East of Durham, the MTO is planning to widen the entire length of Highway 401 to six lanes. Preliminary work includes the widening of the bridge over the Trent River in Trenton, as well as the realignment of some roads alongside the highway. In 2012, the highway was widened to six lanes for 6 km (3.7 mi) through Kingston between exits 613 and 619.
Highway 401 features 19 service centres controlled by the MTO. These service centres were announced in 1961 following public outcry over the lack of rest stops. They provide a place to park, rest, eat and refuel 24 hours a day.
The centres were originally leased to and operated by several major gasoline distributors; however, those companies have chosen not to renew their leases as the terms end. In response, the MTO put the operation of the full network of service centres out for tender, resulting in a 50-year lease with Host Kilmer Service Centres, a joint venture between hospitality company HMSHost (a subsidiary of Autogrill) and Larry Tanenbaum's investment company Kilmer van Nostrand, which operates the rest areas under the ONroute brand.
Seventeen of the centres along Highway 401 will be reconstructed entirely. Two centres that were rebuilt in the late 1990s, specifically Newcastle and Ingersoll, will not be redeveloped at this time. Work on 15 of the 17 service centres to be reconstructed began in late 2009 or early 2010. The new service centres, opening in phases beginning in July 2010, feature a Canadian Tire gas station, an HMSHost-operated convenience store known as "The Market", as well as fast food brands such as Tim Hortons, A&W and Burger King.
|56, 63||Reopened as of October 1, 2010|
|137, 149||Reopened as of October 1, 2010|
|Ingersoll||Westbound||222, 230||Will not be redeveloped at this time. Leased by Imperial Oil.|
|Woodstock||Eastbound||222, 230||Closed for reconstruction on March 31, 2010; reopened July 2011|
|286, 295||Closed for reconstruction as of September 7, 2011; to re-open October 2013.|
|Mississauga||Eastbound||333, 336||Permanently closed as of September 30, 2006|
|Newcastle||Westbound||440, 448||Will not be redeveloped at this time. Leased by Imperial Oil.|
|Port Hope||Eastbound||448, 456||Reopened by June 2011|
|Trenton North||Westbound||509, 522||Reopened as of October 1, 2010|
|Trenton South||Eastbound||Reopened March 2011|
|Camden East||Westbound||582, 593||Closed for reconstruction March 31, 2010; reopened June 2011|
|Odessa||Eastbound||599, 611||Open during 2010–11 reconstruction (while a new structure was built directly west of a now-demolished original facility on same property). New facility opened June 2011|
|Mallorytown North||Westbound||675||Reopened February 1, 2011|
|Mallorytown South||Eastbound||685||Reopened June 28, 2012.|
|Morrisburg||Eastbound||750, 758||Reopened as of October 1, 2010|
|Ingleside||Westbound||758, 770||Reopened April 2011|
|Bainsville||Westbound||825||Reopened as of October 1, 2010|
Exit list 
||–||Ojibway Parkway||Under construction|
||–||E. C. Row Expressway||Under construction; westbound exit and eastbound entrance|
||–||Highway 3 (Huron Church Road) – Ambassador Bridge to U.S.||Under construction|
||–||Todd Lane||Under construction|
||–||Service Road||Under construction|
|10.1||6.3||–||Highway 3 west – Ambassador Bridge to U.S.||Westbound exit and eastbound entrance; interchange under construction; no exit number assigned|
|12.6||7.8||13||Dougall Parkway – Detroit–Windsor Tunnel to U.S.||Westbound exit and eastbound entrance; formerly Highway 3B / Highway 401A|
|13.4||8.3||14||County Road 46 (Walker Road) – Windsor, Essex||Formerly Highway 98|
||Tecumseh||20.4||12.7||21||County Road 19 (Manning Road) – Tecumseh|
|27.5||17.1||28||County Road 25 (Puce Road) – Puce|
|33.7||20.9||34||County Road 27 (Belle River Road) – Woodslee, Belle River|
|40.0||24.9||40||County Road 31 (French Line Road) – St. Joachim|
|47.3||29.4||48|| Highway 77 south – Leamington
County Road 35 north (Comber Road) – Stoney Point
|55.7||34.6||56||County Road 42 – Tilbury||Formerly Highway 2|
||Tilbury||62.8||39.0||63||County Road 2 (Queen's Line)||Formerly Highway 2|
|Chatham||80.9||50.3||81||County Road 27 (Bloomfield Road)|
|89.3||55.5||90|| Highway 40 north
County Road 11 south (Communication Road) – Blenheim
|101.0||62.8||101||County Road 15 (Kent Bridge Road) – Dresden, Ridgetown|
|108.3||67.3||109||County Road 17 / County Road 21 (Victoria Road) – Thamesville, Ridgetown||Formerly Highway 21|
|116.2||72.2||117||County Road 20 (Orford Road) – Highgate|
||West Elgin||129.2||80.3||129||County Road 103 (Furnival Road) – Wardsville, Rodney|
|137.3||85.3||137||County Road 76 (Graham Road) – West Lorne||Formerly Highway 76|
|Dutton/Dunwich||148.5||92.3||149||County Road 8 (Currie Road) – Dutton|
|157.4||97.8||157||County Road 14 (Iona Road) – Melbourne, Iona|
|164.1||102.0||164||County Road 20 (Union Road) – Port Stanley, Shedden|
||176.7||109.8||177||Highway 4 (Colonel Talbot Road) – St. Thomas||Signed as Exit 177A (south) and Exit 177B (north). Reconstruction to begin in 2015, turning the cloverleaf interchange into a parclo|
||179||Wonderland Road||Construction to begin in 2013|
|183.2||113.8||183||Highway 402 west – Sarnia||Westbound exit and eastbound entrance|
|186.8||116.1||187||Exeter Road||Westbound exit, Formerly Highway 135 west|
|189.1||117.5||189||Highbury Avenue – St. Thomas||Formerly Highway 126|
|193.6||120.3||194||Veterans Memorial Parkway||Formerly Highway 100. Reconstruction and expansion from a 3-way to 4-way interchange to begin in 2015|
||Thames Centre||195.5||121.5||195||County Road 74 (Westchester Bourne) – Nilestown, Belmont||Formerly Highway 74|
|199.3||123.8||199||County Road 32 (Dorchester Road) – Dorchester|
|203.0||126.1||203||County Road 73 (Elgin Road) – Aylmer||Formerly Highway 73|
|208.5||129.6||208||County Road 30 (Putnam Road) – Putnam, Avon|
|216.0||134.2||216||County Road 10 (Culloden Road)|
|218.5||135.8||218|| Highway 19 south
County Road 119 north (Plank Line) – Tillsonburg
|South-West Oxford||222.2||138.1||222||County Road 6 – Stratford, Embro|
|229.8||142.8||230||County Road 12 (Sweaburg Road / Mill Street) – Sweaburg|
|231.9||144.1||232||County Road 59 – Delhi||Formerly Highway 59|
|235.3||146.2||235||Highway 403 east – Brantford, Hamilton||Eastbound exit and westbound entrance|
|236.3||146.8||236||County Road 15 (Towerline Road) – Woodstock|
|237.9||147.8||238||County Road 2 – Paris, Woodstock||Formerly Highway 2|
|Blandford-Blenheim||250.1||155.4||250||County Road 29 (Drumbo Road) – Innerkip, Drumbo|
||North Dumfries||267.9||166.5||268||Regional Road 97 (Cedar Creek Road) – Cambridge, Plattsville, Ayr||Signed as Exit 268A (east) and Exit 268B (west) eastbound; formerly Highway 97|
|Kitchener, Cambridge||275.0||170.9||275||Regional Road 28 (Homer Watson Boulevard / Fountain Street)|
|277.9||172.7||278|| Highway 8 north – Kitchener, Waterloo
Regional Road 8 south – Cambridge
|Signed as Exit 278A (east) and Exit 278B (west) eastbound|
|Cambridge||282.5||175.5||282||Regional Road 24 (Hespeler Road) to Highway 24|
||284||Regional Road 36 south (Franklin Boulevard)||Eastbound exit and westbound entrance|
|286.5||178.0||286||Regional Road 33 (Townline Road)
County Road 33 (Townline Road)
|295.7||183.7||295||Highway 6 north – Guelph||West end of Highway 6 concurrency|
|300.1||186.5||299|| Highway 6 south – Hamilton
County Road 46 (Brock Road) – Guelph, Hamilton
|East end of Highway 6 concurrency|
||Milton||311.9||193.8||312||Regional Road 1 (Guelph Line) – Burlington, Campbellville|
|320.1||198.9||320||Regional Road 25 – Acton, Milton||Formerly Highway 25; GO Transit bus stop on eastbound ramp.|
|323.8||201.2||324||Regional Road 4 (James Snow Parkway)|
|328.0||203.8||328||Regional Road 3 (Trafalgar Road) – Oakville, Halton Hills, Georgetown|
|330.4||205.3||330||Highway 407||Signed as Exit 330 westbound; as Exit 330A (west) and Exit 330B (east) eastbound; no access from westbound Highway 407 to eastbound Highway 401 or westbound Highway 401 to eastbound Highway 407|
||Mississauga||332.7||206.7||333||Winston Churchill Boulevard|
|336.1||208.8||336||Regional Road 1 (Mississauga Road / Erin Mills Parkway)|
|339.6||211.0||340||Mavis Road||Exit opened in 1998.|
|341.7||212.3||342||Hurontario Street||Formerly Highway 10|
|344.5||214.1||344||Highway 403 / Highway 410 – Hamilton, Brampton||No access from eastbound 401 to westbound 403 or eastbound 403 to westbound 401|
|346.0||215.0||346||Regional Road 4 (Dixie Road)|
|348||Highway 427 / Renforth Drive – Toronto Pearson International Airport, Downtown Toronto||401–427 interchange. Exit 348 (eastbound exit and westbound entrance), Exit 350 (eastbound exit and westbound entrance), Exit 351 (westbound exit and eastbound entrance) and Exit 352 (westbound exit and eastbound entrance).|
|352||Highway 427 south|
|353.5||219.7||354||Dixon Road / Martin Grove Road|
||355|| Highway 409 – Toronto Airport
|Westbound exit and eastbound entrance|
|358.9||223.0||359||Highway 400 north (south to Black Creek Drive) – Barrie||Eastbound express access to Highway 400|
|360.5||224.0||360||Jane Street||Ramps removed; access to Jane Street via Black Creek Drive|
|364.0||226.2||364||Dufferin Street, Yorkdale Road||Eastbound exit and westbound entrance|
|364.8||226.7||365||Allen Road, Yorkdale Road||Westbound exit is a left-hand exit from collector lanes, and right-hand exit from express lanes. Westbound access to Dufferin Street via Yorkdale Road.|
|366.2||227.5||366||Bathurst Street||Westbound exit and eastbound entrance (access only from northbound Bathurst Street). Westbound entrance and eastbound exit ramps removed. Westbound exits to Wilson Avenue, about 200m west of Bathurst Street)|
|367.3||228.2||367||Avenue Road||Formerly Highway 11A|
|369.0||229.3||369||Yonge Street||Formerly Highway 11|
|374.9||233.0||375|| Highway 404 north – Richmond Hill, Newmarket
Don Valley Parkway – Downtown Toronto
|From eastbound 401, access to Sheppard Avenue via northbound 404 from 401 collector lanes only|
|376.3||233.8||376||Victoria Park Avenue|
|380.8||236.6||380||Brimley Road south, Progress Avenue||Eastbound exit and westbound entrance from northbound Brimley Road; exit opened February 18, 1988|
|383.2||238.1||383||Markham Road||Formerly Highway 48|
|385.0||239.2||385||Neilson Road||Exit opened in 1983|
|390.3||242.5||390||Highway 2 / Highway 2A (Kingston Road, Sheppard Avenue (westbound), Port Union Road (eastbound))||Signed as Exit 392 westbound|
||Pickering||394.0||244.8||394||Regional Road 38 (Whites Road)||Exit opened in 1983|
|396.6||246.4||397||Regional Road 29 (Liverpool Road)||Westbound exit and entrance|
|398.3||247.5||399||Regional Road 1 (Brock Road)||Exit opened September 11, 1974, replacing the full-access interchange at Liverpool Road|
|Ajax||400.3||248.7||400||Church Street||Removed, exit replaced with Westney Road interchange (Exit 401) in 1986|
|401.3||249.4||401||Regional Road 31 (Westney Road)||Replaced Exit 400 (Church Street) in 1986 as part of Go Transit expansion east of Pickering|
|402.5||250.1||403||Regional Road 44 (Harwood Avenue)||Removed, exit replaced with Salem Road interchange (Exit 404) in 2003|
|404.3||251.2||404||Regional Road 41 (Salem Road)||Replaced Exit 403 (Harwood Avenue) in December 2003|
||407||Regional Road 23 (Lakeridge Road)||Partial interchange planned; westbound entry and eastbound exit; construction to begin in 2013|
||408||West Durham Link||Construction to begin in 2013, completed by 2015.|
|409.6||254.5||410||Durham Regional Highway 12 (Brock Street)||Formerly Highway 12|
|412.1||256.1||412||Regional Road 26 (Thickson Road)|
|Oshawa||415.2||258.0||415||Regional Road 53 (Stevenson Road)||Replaced Exit 416 (Park Road) in 2009|
|415.8||258.4||416||Regional Road 54 (Park Road)||Removed, exit replaced with nearby Stevenson Road interchange (Exit 415) in 2009|
|417.6||259.5||417||Regional Road 2 (Simcoe Street)||Westbound exit via Exit 418|
|418.5||260.0||418||Regional Road 16 (Ritson Road)|
|419.4||260.6||419||Regional Road 22 / Regional Road 33 (Bloor Street / Harmony Road)||Access to Regional Road 56/Farewell Street|
|Clarington||425.4||264.3||425||Regional Road 34 (Courtice Road) – Courtice|
|428.4||266.2||428||Holt Road (Darlington Nuclear Generating Station)||Eastbound exit and westbound entrance|
|431.3||268.0||431||Regional Road 57 (Waverley Road) – Bowmanville|
|432.4||268.7||432||Regional Road 14 (Liberty Street) – Bowmanville, Port Darlington|
|436.3||271.1||436||Highway 35 / Highway 115 – Peterborough, Orono, Lindsay|
|440.1||273.5||440||Regional Road 17 (Mill Street) – Newcastle, Bond Head|
|448.1||278.4||448||Regional Road 18 (Newtonville Road) – Newtonville|
||Port Hope||456.6||283.7||456||Wesleyville Road|
|461.4||286.7||461||County Road 2 – Welcome||Formerly Highway 2|
|464.8||288.8||464||County Road 28 – Peterborough, Bewdley||Formerly Highway 28|
|Cobourg, Hamilton||472.6||293.7||472||County Road 18 (Burnham Street) – Gores Landing|
|474.5||294.8||474||County Road 45 – Norwood, Baltimore||Formerly Highway 45|
|Alnwick/Haldimand||487.0||302.6||487||County Road 23 (Lyle Street) – Centreton, Grafton|
|Cramahe||497.2||308.9||497||County Road 25 (Percy Street / Big Apple Drive) – Colborne, Castleton|
|Brighton||509.7||316.7||509||County Road 30 – Brighton, Campbellford||Formerly Highway 30|
||Quinte West||520.4||323.4||522||County Road 40 (Wooler Road) – Trenton|
|525.4||326.5||525||County Road 33 – Trenton, Frankford, Batawa||Formerly Highway 33|
|526.5||327.2||526||County Road 4 (Glen Miller Road) – Trenton, CFB Trenton|
|538.5||334.6||538||County Road 1 (Wallbridge-Loyalist Road) – Stirling|
|542.7||337.2||543||Highway 62 – Marmora, Madoc to County Road 14||Signed as Exit 543A (south) and Exit 543B (north); formerly Highway 14|
|543.2||337.5||544||Highway 37 – Tweed|
|Tyendinaga||555.7||345.3||556||County Road 7 (Shannonville Road) – Shannonville, Tyendinaga Mohawk Territory|
|566.4||351.9||566|| Highway 49
County Road 15 (Marysville Road) – Picton, Deseronto, Tyendinaga Mohawk Territory
|570.5||354.5||570||County Road 10 (Deseronto Road) – Deseronto|
|Lennox and Addington||Greater Napanee|
|578.8||359.6||579||County Road 41 – Napanee, Kaladar||Formerly Highway 41|
|582.1||361.7||582||County Road 5 (Palace Road) – Napanee, Newburgh|
|Loyalist||593.4||368.7||593||County Road 4 (Camden East Road) – Millhaven, Camden East||Formerly Highway 133|
|598.8||372.1||599||County Road 6 (Wilton Road) – Yarker, Amherstview, Odessa|
||610.8||379.5||611||County Road 38 – Harrowsmith, Sharbot Lake||Formerly Highway 38|
|613.0||380.9||613||County Road 9 (Sydenham Road), Sydenham|
|615.3||382.3||615||Sir John A. Macdonald Boulevard|
|617.0||383.4||617||County Road 10 (Division Street) – Westport|
|619.0||384.6||619||County Road 11 (Montreal Street) – Battersea|
|623.0||387.1||623||Highway 15 – Smiths Falls, Ottawa|
|631.9||392.6||632||County Road 16 (Joyceville Road) – Joyceville|
|Leeds and Grenville
||Gananoque, Leeds and the Thousand Islands||645.1||400.8||645||County Road 32 – Crosby||Formerly Highway 32|
|646.7||401.8||647||Thousand Islands Parkway – Ivy Lea, Rockport||Eastbound exit and westbound entrance|
|Leeds and the Thousand Islands|
|647.9||402.6||648|| Highway 2 – Gananoque
County Road 2
|Eastbound via Exit 647|
|658.8||409.4||659||County Road 3 (Reynolds Road) – Ivy Lea, Lansdowne, Rockport|
|661.0||410.7||661||Highway 137 ( I-81 to Alexandria Bay, New York)|
|Front of Yonge||675.5||419.7||675||County Road 5 (Mallorytown Road) – Mallorytown, Athens, Rockport|
|684.7||425.5||685||Thousand Islands Parkway||Westbound exit and eastbound entrance|
|686.7||426.7||687||County Road 2 – Brockville||Formerly Highway 2|
|Brockville||696.2||432.6||696||County Road 29 – Brockville, Smiths Falls||Formerly Highway 29 / Highway 42|
|698.0||433.7||698||County Road 6 (North Augusta Road) – Brockville, North Augusta|
|Augusta||704.8||437.9||705||County Road 15 (Maitland Road) – Merrickville, Maitland|
|Prescott||716.2||445.0||716||County Road 18 (Edward Street) – Prescott, Domville|
|720.1||447.4||721A||Highway 416 north – Ottawa, Kemptville||Eastbound exit and westbound entrance; signed as Exit 721 eastbound|
|721.2||448.1||721B||Highway 16 (to NY 37) – Kemptville, Johnstown and Ogdensburg, New York||Signed as Exit 721 westbound|
|730.0||453.6||730||County Road 22 (Shanly Road) – Cardinal|
|Stormont, Dundas and Glengarry
||South Dundas||737.8||458.4||738||County Road 1 (Carman Road) – Iroquois|
|750.2||466.2||750||County Road 31 – Ottawa, Morrisburg, Winchester||Formerly Highway 31|
|758.2||471.1||758||Upper Canada Road|
|South Stormont||769.5||478.1||770||County Road 14 (Dickinson Drive) – Ingleside|
|777.8||483.3||778||County Road 35 (Moulinette Road) – Long Sault|
|786.4||488.6||786||County Road 33 (Power Dam Drive)||Eastbound exit and westbound entrance|
|Cornwall||789.5||490.6||789||Highway 138 (Brookdale Avenue) – Ottawa, Hawkesbury, Three Nations Crossing to Massena, New York|
|796.1||494.7||796||County Road 44 (Boundary Road)|
|804.6||500.0||804||County Road 27 (Summerstown Road) – Summerstown|
|813.8||505.7||814||County Road 2 / County Road 34 – Lancaster, Alexandria, Hawkesbury||Formerly Highway 2 south / Highway 34 north|
|825.4||512.9||825||County Road 23 (4th Line Road, Curry Hill Road)|
A-20 continues east towards Montreal
|1.000 km = 0.621 mi; 1.000 mi = 1.609 km
• Closed/former Unopened
See also 
- The first interchange on Highway 401 (Dougall Avenue) is numbered Exit 13, but is only 2 km (1.2 mi) from Highway 3. The Windsor–Essex Parkway will likely incorporate the initial kilometres into exit numbers along its length.
- The Department of Highways Fiscal Report for the year ending March 31, 1952, claims "Controlled Access Highways nos. 400 and 401 were signed". However, all other sources claim July.
- Ministry of Transportation and Communications (1972). pp. 8–9.
- Ministry of Transportation of Ontario (2008). "Annual Average Daily Traffic (AADT) counts". Government of Ontario. Retrieved November 3, 2011.
- 2009–2010 OBW/ORA Handbook for Students Coming to Ontario from Baden-Württemberg Rhône-Alpes. Ontario Program Office, OBW/ORA Student Exchange Programs, York University. August 7, 2009. p. 26. "401 The Four-Oh-One: highway between Windsor and the Ontario / Quebec border"
- Maier, Hanna (October 9, 2007). Long-Life Concrete Pavements in Europe and Canada (Report). Federal Highway Administration. http://international.fhwa.dot.gov/pubs/pl07027/llcp_07_02.cfm. Retrieved May 1, 2010. "The key high-volume highways in Ontario are the 400-series highways in the southern part of the province. The most important of these is the 401, the busiest highway in North America, with average annual daily traffic (AADT) of more than 425,000 vehicles in 2004 and daily traffic sometimes exceeding 500,000 vehicles."
- Canadian NewsWire (August 6, 2002). Ontario government investing $401 million to upgrade Highway 401 (Report). Ministry of Transportation of Ontario. "Highway 401 is one of the busiest highways in the world and represents a vital link in Ontario's transportation infrastructure, carrying more than 400,000 vehicles per day through Toronto."
- Thün, Geoffrey; Velikov, Kathy. "The Post-Carbon Highway". Alphabet City. Archived from the original on July 5, 2010. Retrieved January 2, 2012. "It is North America’s busiest highway, and one of the busiest in the world. The section of Highway 401 that cuts across the northern part of Toronto has been expanded to eighteen lanes, and typically carries 420,000 vehicles a day, rising to 500,000 at peak times, as compared to 380,000 on the I-405 in Los Angeles or 350,000 on the I-75 in Atlanta (Gray)."
- Shragge pp. 93–94.
- "Highway 401 – The story". John G. Shragge. 2007. Archived from the original on March 28, 2008. Retrieved February 12, 2010.
- "Engineering Feats: 401 is the busiest highway in North America". The Midland Free Press (Sun Media). 2008. Retrieved March 5, 2010.
- Ministry of Transportation (2003).
- Google Inc. Google Maps – Driving directions from Toronto, ON to Montreal, QC (Map). Cartography by Google, Inc. http://maps.google.ca/maps?f=d&source=s_d&saddr=Toronto,+ON&daddr=Montreal,+QC&hl=en&geocode=&mra=ls&sll=42.78714,-80.976825&sspn=3.377959,6.987305&ie=UTF8&ll=44.606113,-76.508789&spn=3.277071,6.987305&t=h&z=7. Retrieved March 5, 2010.
- Peter Heiler Ltd (2010). Ontario Back Road Atlas (Map). Cartography by MapArt. ISBN 978-1-55198-226-7.
- Detroit River International Crossing Study team (May 1, 2008). "Parkway Map" (PDF). URS Corporation. Retrieved February 26, 2010.
- Ministry of Transportation (2003), section T18–19.
- Detroit River International Crossing Study team (May 1, 2008). "The DRIC Announces Preferred Access Road" (Press release). URS Corporation. Retrieved February 26, 2010.
- Detroit River International Crossing Study team (July 2009). "Initial Construction" (PDF). URS Corporation. Retrieved February 26, 2010.
- Government of Ontario (1990). Ontario Official Road Map (Map).
- "Location and Geography of Sarnia–Lambton". Government of Ontario. Retrieved May 7, 2011.
- Planning Department. "Land Use History". City of Windsor. Retrieved April 2, 2012.
- "Thames River – Fact Sheet". The Canadian Heritage Rivers System. Retrieved August 5, 2010.
- Butorac p. 10.
- Hall, Joseph (October 2, 1999). "Boredom becomes a killer on 401 ; Straight and smooth, 'carnage alley' encourages a lethal lack of attention". The Toronto Star. p. 1. Retrieved March 24, 2010.
- "Crash area long known as 'Carnage Alley'". The Toronto Star. June 8, 2000. p. A. 4. Retrieved March 24, 2010.
- Ministry of Transportation of Ontario (March 2007). Canada and Ontario Making Improvements to Highway 401 in Essex County (Report). Canadian News Wire.
- Ministry of Transportation of Ontario (June 26, 2006). "Canada and Ontario Improving Highway 401 in London". Transport Canada. Retrieved March 14, 2010.
- MapArt (2008). London & Area (Map). ISBN 978-1-55368-648-4.
- Ministry of Transportation (2003), section R23–24.
- Carter-Whitney, Maureen; Esakin, Thomas C. (2010) (PDF). Ontario's Greenbelt in an International Context (Report). Canadian Institute for Environmental Law and Policy. p. 7. ISBN 978-0-9812103-4-6. http://www.cielap.org/pdf/GreenbeltInternationalContext2010.pdf. Retrieved May 5, 2010.
- McIlwraith p. 222.
- Rand McNally 2007, p. 4.
- "Directions". Yorkdale Shopping Centre. Retrieved March 10, 2011.
- "Directions". Scarborough Town Centre. Retrieved March 10, 2011.
- "Directions / Mall Hours". Pickering Town Centre. Retrieved March 10, 2011.
- Peter Heiler Ltd (2008). Golden Horseshoe (Map). pp. 103, 107–112, 266–267, 459, 466, section E3–K44, R8–S16, E44–F46. ISBN 978-1-55198-877-1.
- Lorenz, Matt; Elefteriadou, Lily (July 2000). "A Probabilistic Approach to Defining Freeway Capacity and Breakdown" (PDF). Fourth International Symposium on Highway Capacity, Proceedings (The Pennsylvania Transportation Institute): 85. Retrieved June 10, 2010.
- Yagar, Sam; Hui, Richard (January 26, 2007). "Systemwide Analysis of Freeway Improvements". Transportation Research Record (Transportation Research Board of the National Academies) 1554: 172–183. doi:10.3141/1554-21. ISSN 0361-1981. Retrieved April 23, 2010.
- Ministry of Transportation of Ontario. "About COMPASS – Systems in Operation". Government of Ontario. Retrieved March 1, 2010.
- Ministry of Transportation of Ontario. "Freeway Traffic Management Systems". Government of Ontario. Retrieved March 1, 2010.
- Ministry of Transportation of Ontario. "Interactive Map". Government of Ontario. Retrieved March 1, 2010.
- Google Inc. Google Maps – Highway 401 between the Highway 403 and 410 junction and Highway 427 (Map). Cartography by Google, Inc. http://maps.google.ca/maps?f=d&source=s_d&saddr=43.63731,-79.665046&daddr=King's+Hwy+401%2FMacDonald-Cartier+Fwy&hl=en&geocode=%3BFZxOmgIdJHxB-w&mra=dme&mrcr=0&mrsp=0&sz=18&sll=43.637966,-79.662455&sspn=0.00368,0.006523&ie=UTF8&ll=43.65595,-79.617233&spn=0.470954,0.834961&t=h&z=11. Retrieved April 28, 2009.
- City of Toronto (1959). Toronto Transportation Plan (Map).
- Google Inc. Google Maps – Highway 401 between Highway 409 and Brock Road (Map). Cartography by Google, Inc. http://maps.google.ca/maps?f=d&source=s_d&saddr=King's+Hwy+401%2FMacDonald-Cartier+Fwy&daddr=43.838071,-79.072021&hl=en&geocode=FTXUmgId7v9B-w%3B&mra=dme&mrcr=0&mrsp=1&sz=18&sll=43.837553,-79.072407&sspn=0.003668,0.006523&ie=UTF8&ll=43.733399,-79.315796&spn=0.470346,0.834961&t=h&z=11. Retrieved April 28, 2009.
- Ministry of Natural Resources Canada. Canadian Topographic Atlas – Merging of Highway 401's four carriageways into two (Map). http://atlas.nrcan.gc.ca/site/english/maps/topo/map?layers=nodata_ntdb_50k%20north_arrow%20other_features%20roads%20hydrography%20boundary%20builtup%20vegetation%20populated_places%20railway%20power_network%20manmade_features%20designated_areas%20water_features%20water_saturated_soils%20relief%20contours%20toponymy%20contour&scale=300000.000000&mapxy=1388087.1145965795%20-369619.86823442107&map_layer%5Bnortharrow%5D_class%5B0%5D_style%5B0%5D=ANGLE%20-15.446039104962495&mapsize=750%20666&urlappend=. Retrieved June 9, 2010.
- M.M Dillon Limited (July 1983). Don Valley Corridor Transportation Study (Report). Metropolitan Toronto Technical Transportation Planning Committee. p. iii. "nearly 52% of the vehicles entering the [study] corridor arrived via Highway 401."
- Google Inc. Google Maps – Reduction of through-lanes on Highway 401 near Salem Road in Ajax (Map). Cartography by Google, Inc. http://maps.google.com/?ie=UTF8&hq=&hnear=Toronto,+Toronto+Division,+Ontario,+Canada&ll=43.855744,-79.010314&spn=0.004154,0.011351&t=k&z=17. Retrieved June 10, 2010.
- Follert, Jillian (October 10, 2009). "Oshawa man frustrated by empty bridge during repatriations". Oshawa This Week (Metroland Media Group). Archived from the original on July 16, 2011. Retrieved December 30, 2011.
- "Notice of Construction at Hwy 401 in City of Oshawa and Bowmanville". Ontario Trucking Association. May 27, 2011. Retrieved June 25, 2011.
- Google Inc. Google Maps – Highway 401 from Highway 35 / 115 junction to Cobourg (Map). Cartography by Google, Inc. http://maps.google.ca/maps?f=d&source=s_d&saddr=ON-401+E&daddr=ON-401+E&hl=en&geocode=FbrqnQId8F1Q-w%3BFSEgnwIdjUpW-w&mra=dme&mrcr=0&mrsp=1&sz=15&sll=43.983613,-78.218408&sspn=0.014112,0.027595&ie=UTF8&ll=43.944878,-78.431396&spn=0.223958,0.441513&t=h&z=11. Retrieved May 11, 2010.
- Ministry of Natural Resources Canada. Canadian Topographic Atlas – Cobourg to Trenton near Lake Ontario (Map). http://atlas.nrcan.gc.ca/site/english/maps/topo/map?layers=nodata_ntdb_50k%20north_arrow%20other_features%20roads%20hydrography%20boundary%20builtup%20vegetation%20populated_places%20railway%20power_network%20manmade_features%20designated_areas%20water_features%20water_saturated_soils%20relief%20contours%20toponymy%20contour&scale=300000.000000&mapxy=1388087.1145965795%20-369619.86823442107&map_layer&91northarrow%93_class%910%93_style%910%93=ANGLE%20-15.446039104962495&mapsize=750%20666&urlappend=. Retrieved June 9, 2010.
- Peter Heiler Ltd (2009), section C59.
- Peter Heiler Ltd (2010), pp. 37, 50, section A59–C61.
- Peter Heiler Ltd (2010), p. 50, section X64–Y64.
- Peter Heiler Ltd (2010), p. 69, section S73–T74.
- A.A.D.T. Traffic Volumes 1955–1969 And Traffic Collision Data 1967–1969 (Report). Department of Highways. 1970. pp. 5–11.
- Ministry of Transportation of Ontario (September 13, 2008). "Contract #: 2008–4009". Government of Ontario. Retrieved March 11, 2010.
- Emery pp. 179–182.
- Filey, Mike (November 20, 2011). "Road Pioneers of the Past". The Toronto Sun. p. 44.
- "Toronto–Hamilton Highway Proposed". The Toronto World 34 (12125). January 22, 1914. p. 14. Retrieved February 9, 2010.
- Shragge p. 55.
- Shragge p. 55. "...the Toronto-to-Hamilton highway which, when completed in 1917, was both Ontario's first concrete highway and one of the longest such inter-city stretches in the world."
- "Increased Volume of Traffic". Toronto World 40 (14472). June 26, 1920. p. 7. Retrieved February 12, 2010.
- Shragge pp. 79–81.
- Filey pp. 61–62.
- Stamp pp. 19–20.
- "Hopes to Improve Roads". The Gazette 165 (42) (Montreal). February 18, 1936. p. 14. Retrieved February 9, 2010.
- English, Bob (March 16, 2006). "Remember that 'little four-lane freeway?'". Globe And Mail (Toronto). Retrieved February 9, 2010. "...the freeway concept was promoted by Hamiltonian Thomas B. McQuesten, then the highway minister. The Queen Elizabeth Way was already under construction, but McQuesten changed it into a dual-lane divided highway, based on Germany's new autobahns."
- Stamp pp. 11–12.
- "Highway Conditions In Eastern Ontario". The Ottawa Citizen 94 (127) (Southam Newspapers). November 13, 1936. p. 29. Retrieved February 16, 2010.
- Brown p. 105.
- "Road Convention Dates Announced". The Gazette (Montreal). June 7, 1938. Retrieved February 10, 2010.
- "Ontario To Bar All Gas Stands On Speedways". The Gazette 167 (214) (Montreal). September 7, 1938. pp. 1, 19. Retrieved February 12, 2010.
- "Debts Conversion Urged By Hepburn". The Gazette 67 (296) (Montreal). September 12, 1938. p. 10. Retrieved February 17, 2010.
- Stamp p. 31.
- "Bypassing Approved". The Gazette 167 (214) (Montreal). September 7, 1938. p. 19. Retrieved March 16, 2010.
- Annual Report (Report). Department of Highways. April 1942. p. 9.
- Staff (May 6, 1942). "To Open Highway Soon". The Toronto Star. p. 15.
- Shragge p. 89.
- Woodsworth, Charles J. (October 17, 1952). "Tasteless Names For Ontario Roads". The Evening Citizen 110 (93) (Ottawa: Southam Newspapers). p. 40. Retrieved February 9, 2010.
- "Chronology of Storm Events". Toronto and Region Conservation. Retrieved March 18, 2010.
- "Speed Limit In Ontario Now At 60". The Ottawa Citizen 116 (281) (Southam Newspapers). May 29, 1959. p. 23. Retrieved March 25, 2010.
- "Link Kingston Bypass With Scenic Highway". The Ottawa Citizen 112 (8) (Southam Newspapers). July 8, 1954. p. 16. Retrieved February 9, 2010.
- McKendry, Jennifer (2004). "Chronology of the History of Kingston". Kingston Historical Society. Retrieved January 2, 2012.
- "Ontario Faces Backlog Totalling 920,000,000 In Highways Building". The Ottawa Citizen 113 (206) (Southam Newspapers). March 1, 1956. p. 23. Retrieved March 31, 2010.
- Supertest Oil Co. (1958). Road Map of Ontario (Map). http://ontarioroadmaps.ca/Maps/Oil_Companies/Supertest/1958/Eastern_ON.jpg. Retrieved March 26, 2012.
- Heine, William C. (July 15, 1961). "Highway For Half Canada's Population". The Ottawa Citizen 11 (28) (Southam Newspapers). pp. 1–4, 22. Retrieved April 1, 2010.
- "Drivers Itch To Try Out Road Link". The Ottawa Citizen 118 (632) (Southam Newspapers). July 22, 1961. p. 14. Retrieved April 1, 2010.
- "Freeway Alters Life in Ontario". New York Times. January 17, 1964. p. 45. Retrieved April 2, 2010.
- "401 May Be Renamed Macdonald-Cartier". The Globe and Mail 121 (35,907) (Toronto). January 9, 1965. p. 1. "Premier John Robarts is expected to announce Monday at the 150th birthday dinner for Sir John A. Macdonald that Highway 401 will be renamed the Macdonald–Cartier Freeway. The naming will be in honour of Canada's first prime minister and Georges Etienne Cartier, the Quebec leader in confederation."
- Annual Report (Report). Department of Highways. March 31, 1966. p. 324.
- "Heritage issue drives highway sign debate". The Record (Kitchener). December 23, 1997. p. B5.
- Macdonald-Cartier Freeway Act. Ontario Legislative Assembly. June 11, 2003. Retrieved June 15, 2010.
- Annual Report 1983–1984 (Report). Ontario Ministry of Transportation and Communications. March 31, 1984. http://books.google.com/books?ei=RrEjTNC4E4P7lweD7KyDAQ&ct=result&id=scA7AAAAMAAJ&dq=annual+report+Highway+403&q=403. Retrieved June 24, 2010.
- Josey, Stan (February 10, 1987). "12 lanes to solve tie-ups on 401". The Toronto Star. p. E1. Retrieved April 10, 2010.
- Byrne, Caroline (July 4, 1989). "Highway 401 work will cause chaos for 8 more years". The Toronto Star. p. E2. Retrieved April 10, 2010.
- "Highway 401 Widening to Express/Collector System" (PDF). LEA Consulting. Retrieved April 6, 2010.
- Josey, Stan (July 4, 1989). "Diverse area faces many challenges". The Toronto Star. p. 1. Retrieved April 10, 2010.
- Crone, Greg (February 11, 1993). "Highway 401 from Kitchener to Toronto headed for six lanes, straight through". Kitchener–Waterloo Record. p. A1. Retrieved April 17, 2010.
- "Highway 401 from Kitchener to Toronto headed for six lanes, straight through". The Toronto Star. February 3, 1996. p. A3. Retrieved April 10, 2010.
- "Highway 401 will get major reconstruction". Kitchener–Waterloo Record. May 15, 1991. p. A1. Retrieved April 10, 2010.
- Malloy, Gerry (October 16, 1993). "Highway chevrons aimed at curbing crashes". The Toronto Star. p. 16. Retrieved February 26, 2010.
- Google Inc. Google Maps – Chevrons on Highway 401 near Whitby. No signs indicate their use. (Map). Cartography by Google, Inc. http://maps.google.ca/?ie=UTF8&hq=&hnear=Toronto,+Toronto+Division,+Ontario&ll=43.864362,-78.971786&spn=0,359.97262&z=15&layer=c&cbll=43.864333,-78.971938&panoid=tW1H89_PVFDP1pN4x94Eew&cbp=12,239.8,,0,15.81. Retrieved February 27, 2010.
- Crabtree, Joe (Autumn 1995). Advantage I-75 Prepares to Cut Ribbon on Electronic Clearance 59 (2). United States Federal Highway Administration. Retrieved March 8, 2011.
- ITS America (Winter 1995). Along The Road 59 (3) (ADVANTAGE I-75 Testing Completed ed.). United States Federal Highway Administration. Retrieved February 27, 2010.
- Transport Canada (November 1999) (PDF). En Route to Intelligent Mobility (Report). Government of Canada. p. xiii. http://www.irfnet.ch/files-upload/knowledges/Canda_its_plan.pdf. Retrieved March 8, 2011.
- Seidel, Jeff (December 21, 1999). "'Carnage Alley': Ontario's Highway 401 was a road of death in 1999". Knight-Ridder Newspapers. Retrieved January 15, 2012.
- Annett, Doug (March 2000). "Highway Safety: A Drive in the Country". Canadian Occupational Health and Safety Magazine (Business Information Group). Retrieved August 5, 2010.
- Seidel, Jeff (December 21, 1999). "'Carnage Alley': Ontario's Highway 401 was a road of death in 1999.". Knight Ridder (Tribune News Service). Retrieved August 5, 2010.
- "Killer highway claims ten more car smash victims". The Birmingham Post. September 4, 1999. Retrieved February 22, 2010.
- Robson, Dan (August 30, 2009). "Reliving the horror of the 401 fog". The Toronto Star. Retrieved February 22, 2010.
- McCann, Wendy (August 31, 1999). "Killer Highway 'Pleasant' To Drive". The Hamilton Spectator. p. 3. Retrieved February 22, 2010.
- "401 Incident – Timeline". Windsor Fire and Rescue Services. Retrieved March 21, 2010.
- "Cleanup continues after horrific highway crash". Canadian Broadcasting Corporation. September 5, 1999. Retrieved February 22, 2010.
- "Ontario puts more money into highways than ever before". Today's Trucking. Newcom Business Media. January 5, 2000. Retrieved February 22, 2010.
- "Upgrades, extra police planned for Canada 401". The Blade (Toledo, Ohio). September 18, 1999. p. 8. Retrieved February 22, 2010.
- Robson, Dan (August 30, 2009). "Improvements made to 'Carnage Alley'". The Toronto Star. Retrieved February 19, 2010.
- "Stretch of 401 to be renamed 'Highway of Heroes'". CTV Toronto. August 24, 2007. Retrieved February 3, 2010.
- Office of the Premier (September 7, 2007). 'Highway of Heroes' Signs Unveiled Along Highway 401 (Report). Government of Ontario. http://www.premier.gov.on.ca/news/event.php?ItemID=3752&Lang=En. Retrieved February 3, 2010.
- "Hwy. 401 Will Be Renamed 'Highway of Heroes' to Honour Soldiers". City News. August 24, 2007. Retrieved February 3, 2010.
- Fisher, Pete (August 14, 2011). "Salute to 'Brothers'". The Toronto Sun. pp. 6–7.
- Warmington, Joe (June 23, 2007). "Our own Trail of Tears". The Toronto Sun. p. 3.
- Fisher, Pete (July 13, 2007). "Highway of Heroes: Let's make it official". Northumberland Today. Sun Media. Retrieved February 3, 2010.
- "Section of 401 to be renamed for fallen". The Record (Kitchener). August 24, 2007. Retrieved February 3, 2010.
- Cassin, J. "Highway of Heroes officially dedicated in Port Hope". Northumberland Today (Sun Media). Retrieved August 5, 2010.
- "Evacuees begin returning home after fireball consumes Toronto propane plant". CanWest News Service. August 10, 2010. Retrieved February 21, 2010. "Ontario Provincial Police spokesman Sgt. Cam Woolley said the incident triggered the biggest closure of the 401 in the highway’s history."
- Taylor, Bill (August 11, 2008). "Residents return after blast". The Toronto Star. Retrieved February 21, 2010. "...a 10-kilometre stretch of Canada’s busiest highway, the 401, was shut down as was the southern end of Highway 400, which carries people to and from cottage country. The highway was re-opened at around 8 p.m., but the restricted ramps will remain closed for some time."
- "Highway 401 Reopens Following Propane Facility Blast". CityNews. August 10, 2010. Retrieved February 21, 2010.
- Ministry of Transportation of Ontario (September 7, 2005). "Contract #: 2005–2014". Government of Ontario. Archived from the original on October 30, 2007. Retrieved February 22, 2010.
- "Stevenson interchange open". Oshawa This Week. Metroland Media Group. September 14, 2007. Retrieved October 4, 2007.
- Ministry of Transportation of Ontario (July 14, 2008). "Contract #: 2008–3004". Government of Ontario. Retrieved March 14, 2010.
- Cornies, Larry (December 4, 2010). "'Need for speed' creates havoc on 401". London, Ontario, Canada: London Free Press. Retrieved June 8, 2011. "Except for a few crowning touches that will wait until spring, the massive construction project on a 20-kilometre stretch of Hwy. 401 just east of Woodstock is finally finished."
- Hertz, Barry (July 25, 2007). "Province plans to create 6-lane Highway 401". The National Post (Toronto).
- Detroit River International Crossing Study team. "DRIC Reports (Canada)". Detroit River International Crossing Project. Retrieved February 26, 2010.
- "Windsor's 'Garden of Eden'". Windsor Star. October 9, 2007. Retrieved February 26, 2010.
- Pearson, Craig (February 14, 2008). "Province buying up land for 401 extension". Windsor Star. p. 1. Retrieved February 26, 2010.
- "Couple worries new parkway will surround their home". Canadian Broadcasting Corporation. November 27, 2009. Retrieved December 14, 2011.
- Government of Canada (March 3, 2008). "Border transportation partnership reaches milestone". Transport Canada. Archived from the original on February 25, 2010. Retrieved February 26, 2010.
- Liltwin, Natalie (June 3, 2009). "DRIC controversy goes on". Windsor Star (Canwest Publishing). Retrieved June 16, 2010.
- "Ambassador Bridge boss sues Canada, U.S.". CBC News. March 25, 2010. Retrieved June 16, 2010.
- Kristy, Dylan (May 5, 2011). "Sierra Club, bridge lose bid to derail DRIC". The Windsor Star. Retrieved January 2, 2012.
- Detroit River International Crossing Study team (2010). "What's Next" (PDF). URS Corporation. Retrieved July 6, 2010.
- Doelen, Chris Vander (May 7, 2011). "Parkway work to start in August, MPP says". The Windsor Star. Retrieved January 2, 2012.
- Infrastructure Ontario (2011). "The Windsor–Essex Parkway". Government of Ontario. Retrieved December 28, 2011.
- Battagello, Dave (November 28, 2012). "Gray ‘Moved’ by Tribute to Name Parkway in his Honour". The Windsor Star. Retrieved December 2, 2012.
- Ministry of Transportation of Ontario (2008). "Borders and Gateways". Government of Ontario. Retrieved March 15, 2010.
- Ministry of Transportation of Ontario (August 27, 2007). "Contract #: 2007–3043". Government of Ontario. Retrieved March 14, 2010.
- "401 widening won't happen for years". Chatham This Week (Sun Media). December 5, 2007. Retrieved March 15, 2010.
- URS Corportation (January 12, 2004). "London 401 Preliminary Design Study". City of London, Ontario, Ontario Ministry of Transportation. Retrieved July 5, 2010. "Examine the Highway 401 Corridor in London"
- "London Transportation Master Plan" (PDF). City of London, Ontario. May 10, 2004. Retrieved June 10, 2010. "Planned Capital Project: Wonderland Road South/Highway 401 interchange"
- "London Transportation Report- Southwest Area Plan" (PDF). City of London, Ontario. May 5, 2010. Retrieved June 10, 2010. "Future Interchanges/Upgrade: Colonel Talbot at Highway 401"
- Ontario Ministry of Transportation (August 2011). "Southern Highways Program 2011–2015". Government of Ontario. Retrieved August 21, 2010. "2013–2016: Highway 401 "Colonel Talbot Rd. to Veterans Memorial Parkway, London including Wonderland Road and Veterans Memorial Pkwy New interchange / interchange improvements""
- Transportation Division (November 13, 2007). "Veterans Memorial Parkway, Environmental Study, Official Plan and Zoning Amendment" (PDF). City of London, Ontario. Retrieved April 26, 2010.
- Transportation Division (May 30, 2007). "Veterans Memorial Parkway, Interchange-class environmental assessment study" (PDF). City of London, Ontario. Retrieved April 26, 2010. "Reformatting the Highway 401/VMP interchange"
- "London Long Term Transportation Corridor Protection Study" (PDF). City of London, Ontario. April 4, 2001. Retrieved April 27, 2010. "Note that the proposed widening of Highway 401 to eight lanes through London could reduce the need to widen crossing roadways along Exeter Road and Dingman Drive."
- Ontario Ministry of Transportation (October 2010). "Southern Highways Program 2010–2014". Government of Ontario. Retrieved October 24, 2010. "Projects beyond 2014: Wellington Rd to Highbury Ave, London"
- Planning Housing and Community Services – Transportation Planning (March 31, 2009). "Highway 8 and Highway 401 Interchange Improvements". Region of Waterloo. Retrieved January 2, 2012.
- Ministry of Transportation of Ontario (May 24, 2007). "Ontario’s High Occupancy Vehicle Lane Network: Summary of the Plan for the 400-Series Highways in the Greater Golden Horseshoe". Government of Ontario. Retrieved February 25, 2010. "Figure 2 proposes a vision for "growing the corridors" by building on existing HOV lanes. This involves extending the HOV lanes on Highways 400 and 404 farther north and adding lanes to other key sections such as Highway 401 in Peel Region."
- Swayze, Kevin (December 4, 2011). "Highway 401 Carpool Lanes Proposed". The Record (Kitchener). Retrieved December 4, 2011.
- Ministry of Transportation of Ontario (August 19, 2009). "Contract #: 2009–2031". Government of Ontario. Retrieved February 22, 2010.
- Ministry of Transportation of Ontario (November 30, 2008). "Contract #: 2008–2017". Government of Ontario. Retrieved February 22, 2010.
- Ministry of Transportation of Ontario (July 22, 2009). "Contract #: 2009–2029". Government of Ontario. Retrieved February 22, 2010.
- Ontario Ministry of Transportation (August 2009). "Southern Highways Program 2008–2012". Government of Ontario. Retrieved June 11, 2010. "Projects beyond 2012: Highway 401 / 400 Interchange, Toronto"
- Totten Sims Hubiki Associates (August 17, 2009) (PDF). Highway 407 Environmental Assessment, West Durham Link at Highway 401 (Report). Ministry of Transportation of Ontario. p. 7. http://www.407eastea.com/downloads/2009/Aug/appendix/Appendix%20D%20for%20posting/Page%207.pdf. Retrieved February 17, 2010.
- Totten Sims Hubiki Associates (August 17, 2009) (PDF). Highway 407 Environmental Assessment, East Durham Link at Highway 401 (Report). Ministry of Transportation of Ontario. p. 9. http://www.407eastea.com/downloads/2009/Aug/appendix/Appendix%20D%20for%20posting/Page%209.pdf. Retrieved February 17, 2010.
- Szekely, Reka (June 30, 2009). "Highway 401 between Ajax and Whitby to be widened". Ajax-Pickering News Advertiser (Metroland Media Group). Retrieved February 17, 2010.
- Ministry of Transportation of Ontario (October 14, 2008). "Contract #: 2008–4006". Government of Ontario. Retrieved March 11, 2010.
- Ministry of Transportation of Ontario (November 9, 2009). "Contract #: 2009–4003". Government of Ontario. Retrieved March 11, 2010.
- "HMSHost Corporation and Kilmer Van Nostrand Co. Limited Ink 50-Year Agreement to Build 23 World-Class Service Centres on Major Canadian Highways". CNW Group. April 7, 2010. Retrieved June 5, 2010.
- "Ontario Finalizes Plans For Highway Service Centres". Brock News (Brockville: DCE Productions). April 7, 2010. Retrieved April 9, 2010.
- Ministry of Transportation (2003), section T20, S21, R23–R24, Q27–Q28, P31, O33–P34, N36.
- "ONroute Locations". Host Kilmer Service Centres. Retrieved October 1, 2010.
- Host Kilmer Service Centres (October 1, 2010). "First Phase of Highway 401 Service Centres Complete" (Press release). CNW Group. Retrieved October 1, 2010.
- Wightman, Ken (March 20, 2010). "Celebrating the Doomed Domes of Woodstock Service Centre". Digital Journal. Retrieved September 26, 2010.
- Caldwell, Brian (May 12, 2010). "401 service centres east of Cambridge last to be spruced up". Cambridge Reporter. Metroland Media Group. Retrieved June 6, 2010.
- Ministry of Transportation of Ontario (February 18, 2010). "Ontario Service Centres FAQ". Government of Ontario. Retrieved March 12, 2012.
- Butorac pp. 158–159.
- Norris, Mike (February 2010). "Centres forced to close". Whig Standard (Kingston: Sun Media). Retrieved April 9, 2010.
- Zajac, Ronald (January 17, 2011). "Westbound 401 Service Centre Partly Reopening". Retrieved January 25, 2012.
- "Committee votes to open Brimley Road". The Globe and Mail (Toronto). February 19, 1988. p. A13.
- Annual Report 1983–1984 (Report). Ontario Ministry of Transportation and Communications. March 31, 1984. http://books.google.com/books?ei=RrEjTNC4E4P7lweD7KyDAQ&ct=result&id=scA7AAAAMAAJ&dq=annual+report+Highway+403&q=Highway+403#search_anchor. Retrieved June 24, 2010.
- Public and Safety Information Branch (September 6, 1974). "Opening of New Brock Road Highway 401 Interchange, Closing of Liverpool Road Highway 401 Interchange" (Press release). Ministry of Transportation and Communications.
- Potter, Warren (December 10, 1985). "Ajax Communters Get Partial Relief With New Ramps". The Toronto Star. p. East3.
- Brown, Ron (1997). Toronto's Lost Villages. Toronto: Polar Bear Press. ISBN 1-896757-02-2.
- Butorac, Yvonne (June 1, 1995). Great Exits – The 401. Erin, Ontario: Boston Mills Press. ISBN 1-55046-137-0.
- Emery, Claire; Ford, Barbara (1967). From Pathway to Skyway. Burlington, Ontario: Confederation Centennial Committee of Burlington. pp. 179–182. Retrieved May 3, 2010.
- Filey, Mike (1994). Toronto sketches 3: the way we were. Toronto: Dundurn Press. pp. 61–62. ISBN 1-55002-227-X. Retrieved February 10, 2010.
- McIlwraith, Thomas F. (1997). Looking for old Ontario: two centuries of landscape change. Toronto: University of Toronto Press. ISBN 978-0-8020-7658-8. Retrieved March 13, 2010.
- '401' The Macdonald–Cartier Freeway. Toronto: Ministry of Transportation and Communications. 1972.
- Shragge, John; Bagnato, Sharon (1984). From Footpaths to Freeways. Toronto: Ontario Ministry of Transportation and Communications, Historical Committee. ISBN 0-7743-9388-2.
- Stamp, Robert M. (1987). QEW – Canada's First Superhighway. Erin, Ontario: Boston Mills Press. ISBN 0-919783-84-8.
- Ministry of Transportation (2003). Southern Ontario Road Maps (Map). Cartography by Bryan Simmons, Lori-Anne Martin. http://www.mto.gov.on.ca/english/traveller/map/. Retrieved January 5, 2012.
- Peter Heiler Ltd (2009). Eastern Ontario (Map). Cartography by MapArt. Section C59. ISBN 978-1-55368-222-6.
- Peter Heiler Ltd (2010). Ontario Back Road Atlas (Map). Cartography by MapArt. ISBN 978-1-55198-226-7.
- Rand McNally (2007). Toronto & area map book (Map). Cartography by Perly's. p. 4. ISBN 978-0-88640-928-9.
- Official sites
- Ministry of Transportation of Ontario
- The Rt. Honourable Herb Gray Parkway (Windsor-Essex Parkway) web site
- Live COMPASS Traffic Cameras
- Photos and additional information
- Video of Highway 401 Tilbury and Essex
- Video of Highway 401 between Highway 4 and the Veterans Memorial Parkway
- Video of Highway 401 between Highway 402 and 403
- Video of a segment of Highway 401 between Highway 403 and 8
- Video of Highway 401 between the Humber River and Mississauga Road
- Video of Highway 401's widest segment between Highway 410 and Highway 427
- Video of Highway 401 eastbound in Greater Toronto