|Length||189.95 mi (305.69 km)|
|Restrictions||No hazardous goods and cargo tankers between exits 15/15B and 18 (formerly 18 and 26) in Massachusetts|
|South end||I-95 / US 1 / Route 128 in Canton, MA|
|North end||I-91 in Waterford, VT|
|States||Massachusetts, New Hampshire, Vermont|
|Counties||MA: Norfolk, Suffolk, Middlesex, Essex|
NH: Rockingham, Hillsborough, Merrimack, Belknap, Grafton
Interstate 93 (I-93) is an Interstate Highway in the New England states of Massachusetts, New Hampshire, and Vermont in the United States. Spanning approximately 190 miles (310 km) along a north–south axis, it is one of three primary Interstate Highways located entirely within New England; the other two are I-89 and I-91. The largest cities along the route are Boston, Massachusetts, and Manchester, New Hampshire; it also travels through the New Hampshire state capital of Concord.
I-93 begins at an interchange with I-95, US Route 1 (US 1) and Route 128 in Canton, Massachusetts. It travels concurrently with US 1 beginning in Canton, and, with Route 3 beginning at the Braintree Split on the Braintree–Quincy city line, through the Central Artery in Downtown Boston before each route splits off beyond the Leonard P. Zakim Bunker Hill Memorial Bridge. The portion of highway between the Braintree Split and the Central Artery is named the "Southeast Expressway", while the portion from Boston to the New Hampshire state line is named the "Northern Expressway".
I-93 ends in Waterford, Vermont, at I-91. For most of its length, I-93 indirectly parallels US 3. In New Hampshire, the two highways have several interchanges with each other, as well as a concurrency through Franconia Notch State Park.
I-93's southern terminus is at exit 26 (formerly exit 12) of I-95 in Canton, cosigned with US 1 north. At this junction, I-95 north heads to the northwest (cosigned with US 1 south, as well as Route 128, which begins at the interchange), to serve as the beltway around Boston, while I-95 south runs by itself southwest through Boston's southwestern suburbs toward Rhode Island. The southernmost three miles (4.8 km) of I-93 run east through Boston's southern suburbs, passing through Canton and Randolph. In Randolph, I-93 meets the northern end of Route 24 (Fall River Expressway/AMVETS Memorial Highway) at exit 4. I-93 continues east into Braintree, interchanging with Route 3, the major freeway linking Boston to Cape Cod, at exit 7 (known locally as the "Braintree Split"). Route 3 north joins I-93 and US 1, and the highway turns north toward Boston. These first seven miles (11 km) of I-93 follow what was formerly part of Route 128 before it was truncated at the I-95/I-93 junction.
Upon turning northward, the highway is known as the Southeast Expressway, passing through Quincy and Milton before crossing into the city of Boston over the Neponset River. After the Massachusetts Avenue connector exit, the highway officially becomes the John F. Fitzgerald Expressway, also known as the Central Artery, and passes beneath Downtown Boston. A major intersection with the Massachusetts Turnpike/I-90 (exit 16, formerly 20) takes place just south of Downtown Boston. After the massive interchange, motorists use the O'Neill Tunnel to travel underneath the city and then use the Leonard P. Zakim Bunker Hill Memorial Bridge to cross the Charles River. Two exits are located in the tunnel, where the speed limit is 45 mph (72 km/h). Route 3 leaves the Artery just before the Zakim bridge via exit 18 (formerly 26), and US 1 leaves the Artery just after the bridge, via exit 19 (formerly 27) (no southbound access). From Boston through the rest of Massachusetts, Concord, New Hampshire, appears as the control city on northbound overhead signs. The Artery ends as I-93 continues north out of the city.
I-93 continues through the northern suburbs of Boston, coming to a second interchange with I-95 and Route 128, which run concurrently. Travelers going north can either change over to I-95 north to eventually reach Maine or remain on I-93 toward New Hampshire. Farther north, in Andover, I-93 meets I-495, providing access to Worcester to the southwest and New Hampshire's Seacoast Region to the northeast. Just south of the state line, I-93 crosses the Merrimack River into Methuen, where it intersects Route 110 and Route 113 at exit 43 (formerly 46) just north of the river crossing. Between 2014 and 2018, the Route 110/Route 113 junction beneath I-93 was converted from a rotary to a partial cloverleaf, with the new traffic patterns opening in various stages during 2016 and 2017. On I-93 northbound, the exit was split into 43A (formerly 46A) for Route 110 and Route 113 eastbound, and 43B (formerly 46B) for Route 110 and Route 113 westbound. I-93 then interchanges with the western end of Route 213, a connector between I-93 and I-495. I-93 then crosses into New Hampshire after about one mile (1.6 km).
In all, I-93 has 46 (formerly 48) numbered exits in Massachusetts, although, before the mileage-based exit numbering system was implemented in 2021, several numbers were skipped in and near Boston. Several exits were removed from I-93 to address traffic problems in addition to converting the Central Artery from 6 to 8 to 10 lanes, by reducing the combined number of on- and offramps from 27 to 14. Exit 46 (formerly 48) in Methuen, just before the New Hampshire state line, is the highest-numbered exit along the entire route. I-93 once had only 22 exits prior to the rerouting of I-95 onto Route 128. Nearly the entire length of I-93 in Massachusetts carries four lanes in each direction. Average daily traffic volumes on I-93 in the state range from 100,000 vehicles at the New Hampshire border and 150,000 vehicles at the southern end at I-95 to over 200,000 vehicles through Braintree and Quincy.
I-93 travels just over 131 miles (211 km) in the Granite State, about two-thirds of the highway's total distance. Serving as the main Interstate route in New Hampshire, it connects the state capital, Concord, and its largest city, Manchester. Beyond Concord are the towns of Tilton, Plymouth, and Littleton. I-93 is designated as the Alan B. Shepard Highway, from the Massachusetts line to Hooksett (just north of Manchester at the northern terminus of I-293), as the Everett Turnpike from Hooksett to Concord, and as the Styles Bridges Highway, after the US politician, from Concord to the Vermont line. This section of roadway was constructed between 1961 and 1977.
Between the northern end of I-293 in Hooksett and the beginning of I-89 in Bow, I-93 also carries the northern end of the Everett Turnpike. There is one toll booth along this section, at exit 11 in Hooksett; the toll for passenger cars is $1.00 ($0.50 at the ramp toll booth). This is the only toll collected along the entire length of the highway. I-93 in New Hampshire is also notable for having state liquor stores serve as rest areas, which are passed just after the toll plaza, traveling north. There are separate stores on both sides of the Interstate for travelers in each direction.
I-93 enters New Hampshire at Salem. A rest area and welcome center is available on the northbound side of the freeway, directly before exit 1. I-93 is four lanes wide in each direction for its first 18.5 miles (29.8 km), until the split with I-293 and New Hampshire Route 101 (NH 101), where I-93 drops to three lanes before adding a fourth and fifth lane back to the freeway after the interchange. The construction to widen I-93 to four lanes each way between the Massachusetts–New Hampshire border and its junction with I-293 and NH 101 was fully complete as of April 2021.
I-93 and NH 101 run concurrently for about one mile (1.6 km) before NH 101 exits to the east as its own freeway, serving Portsmouth and the Seacoast Region. I-93 maintains three lanes of traffic in each direction until the junction with I-89, then is a four-lane freeway through most of its journey northward, with the only exception being the Franconia Notch section.
In the state capital of Concord, I-393 heads directly east (cosigned with eastbound US 4 and US 202), providing another route to the Seacoast Region. Westbound US 4 joins I-93 and runs concurrently with it, crossing the Merrimack River again, until exit 17 for Penacook, about five miles (8.0 km) farther north, before exiting westward. Continuing north, I-93 traverses the Lakes Region of New Hampshire and then makes its way north through the heart of the White Mountains Region. I-93 passes through Franconia Notch State Park as a super-two parkway (one lane in each direction) with a 45-mile-per-hour (72 km/h) speed limit, designed to reduce I-93's impact on Franconia Notch. For the trip through Franconia Notch, I-93 and US 3 run concurrently.
Beyond Franconia Notch State Park, US 3 heads northeastward through the Great North Woods Region, while I-93 runs to the northwest. The final town along I-93 in New Hampshire is Littleton, served by four exits. Many motorist services are available at exit 42. After passing through town, it crosses the Connecticut River into Vermont. The last exit along I-93 is exit 44 for Monroe, through which a rest area and welcome center is accessible to travelers on both sides of the highway.
In 2013, a bill was signed by governor Maggie Hassan to raise the speed limit on I-93 to 70 mph (110 km/h) from milemarker 45 to the Vermont border, with the exception of the Franconia Notch Parkway. The new limit took effect on January 1, 2014.
I-93 runs for 11 miles (18 km) in Vermont, with one numbered exit in the state before ending at the interchange with I-91 in St. Johnsbury in the Northeast Kingdom of Vermont. A rest area and welcome center is located along the northbound side of the highway for travelers entering from New Hampshire. The final three miles (4.8 km) of the Interstate actually veer to the southwest while traveling northbound. Vehicles bound for Canada can use northbound I-91 to reach the Derby Line–Stanstead Border Crossing at that Interstate's end, and northwards into Canada as an autoroute freeway into the Canadian province of Quebec. The portion of I-93 in Vermont parallels both US 2 and Vermont Route 18 (VT 18).
The Southeast Expressway was constructed between 1954 and 1959, at the same time the John F. Fitzgerald Expressway (Central Artery) was built. Its northern terminus is at exit 15 (southbound) or 15B (northbound) (former exit 18; Frontage Road) in South Boston, a former Y interchange where the canceled Southwest Corridor/I-95 was to meet with I-93 and run concurrent northward into downtown. The southern terminus is at the Y interchange (the "Braintree Split") at exit 7 in Braintree (the former southern terminus of Route 128). A section of the expressway, beginning south of the Savin Hill overpass and ending just before the Braintree Split, utilizes a zipper lane, in which a movable barrier carves out a reversible high-occupancy vehicle lane (HOV lane) on the non-peak side of the highway during rush hour. Most of the right of way for the Granite Railway in Milton and Quincy was incorporated into the expressway.
The Central Artery, officially the John F. Fitzgerald Expressway, was a section of highway in Downtown Boston constructed in the 1950s and was originally designed as a fully elevated highway. This new highway was greatly disliked by the citizens of the city because it cut the heart of the city in half; cast long, dreary shadows; and was an eyesore to the community. Because of the public outcry, Governor John A. Volpe ordered the southern half of the highway redesigned so that it was underground; this section became known as the Dewey Square Tunnel. With the cancelation of the highway projects leading into the city in 1972 by Governor Francis Sargent, the Central Artery gained the designation of I-93 in 1974. It has also carried the local highway designations of US 1 (since 1989) and Route 3.
By the mid-1970s, I-93 had outgrown its capacity and had begun to deteriorate due to a lack of maintenance. State Transportation Secretary Frederick P. Salvucci, aware of the issues surrounding the elevated roadway, proposed a plan conceived in the early 1970s by the Boston Transportation Planning Review to replace the rusting elevated six-lane Central Artery with a new, more efficient underground roadway. This plan was merged with a long-standing proposal to build a third harbor tunnel to alleviate congestion in the Sumner and Callahan tunnels to East Boston; the new plan became known as the Central Artery/Tunnel Project or the Big Dig.
These new roadways were built during a 12-year period from 1994 to early 2006. The massive project became the largest urban construction project ever undertaken in US history. Construction on the new I-93 segment was not without serious issues: a lengthy federal environmental review pushed the start of construction back from approximately 1990, causing many inflationary increases, while funding for the project was the subject of several political battles between President Ronald Reagan and Representative Tip O'Neill. Major construction on the new roadway was done while maintaining the old roadway, a step that also greatly increased the cost of the project. The original Charles River crossing, named Scheme Z, was the object of great public outcry similar to that of the building of the original highway. The outcry eventually led to the replacement of Scheme Z with a newer, more sleek cable-stayed bridge and complementing exit for Cambridge, increasing the cost even more.
In Downtown Boston, I-93 is made up of the O'Neill Tunnel and Leonard P. Zakim Bunker Hill Memorial Bridge, which spans the Charles River. The underground construction of the tunnel system was completed as of October 2006; however, repairs continue to many parts of the tunnel due to water leakage because of improper construction of the slurry walls supporting the O'Neill Tunnel. The former route of the above-ground Artery, so named "the other Green Monster" by Mayor Thomas Menino, was replaced mostly by open space known formally as the Rose Fitzgerald Kennedy Greenway.
Additional improvements were done in the South Bay section of the highway: the I-90/I-93 interchange was completely redesigned, a new HOV lane extending from the zipper lane in Quincy was added and the South Boston Haul road that was constructed to bypass truck traffic around residential streets in the South End was opened to general traffic.
Hazardous cargos are prohibited from I-93 in Boston over safety issues in the tunnels; these cargos must exit at either the Leverett Circle connector when traveling southbound or at the Massachusetts Avenue exit when traveling northbound.
The Northern Expressway was constructed from Medford to the New Hampshire border between 1956 and 1963. It was extended through Somerville and Charlestown to the Central Artery, US 1, and the planned route of the Inner Belt Expressway (proposed I-695) between 1965 and 1973. Because it was already under construction, the highway was granted an exception to the moratorium on highway expansion inside Route 128 that was announced in 1970.
The original southern terminus of I-93 was in Cambridge (just north of Boston), where it was to meet the Inner Belt (I-695). However, when that route was canceled and the I-95 section into Boston was canceled and rerouted onto Route 128 in the mid-1970s, I-93 was extended an additional 18 miles (29 km) southward down the Central Artery (which had been signed as a concurrency of I-95 and Route 3 before I-95 was rerouted) and the Southeast Expressway (what was then just Route 3) from Boston to Braintree and then west along Route 128 (which was later removed from this section of road in 1997) to terminate at I-95 in Canton.
In an attempt to alleviate rush-hour traffic jams, travel in the breakdown lane of I-93 is permitted between exit 35 (formerly 41) and exit 46 (formerly 43), where the highway currently has three lanes in each direction. This extra travel is permitted on the southbound side on weekdays between 6:00 am and 10:00 am and on the northbound side between 3:00 pm and 7:00 pm to align with commuting hours. However, on most busy days, this fails to prevent traffic delays. The Massachusetts State Police has expressed displeasure with this arrangement, citing that traffic in the breakdown lanes interferes with the ability of emergency vehicles to respond to accidents.
Rapid bridge replacement project
In August 2010, in Medford, a 25-by-7-foot (7.6 m × 2.1 m) section of bridge deck on the northbound side partially collapsed due to age-related structural fatigue. The collapse forced the Massachusetts Department of Transportation (MassDOT) to evaluate the remaining bridges along the corridor, eventually deciding to replace several bridges along the highway in a plan called 93 Fast 14. MassDOT set in motion a plan to replace the superstructure and concrete decks on 14 overpass bridges along that section of the Interstate, using rapid bridge replacement methods. The $98.1-million (equivalent to $121 million in 2021) project replaced bridges originally built in 1957 with a set of prefabricated modular concrete bridges in a series of weekend roadway closures. Traffic was diverted into a series of crossover lanes during construction. The main part of the project took place each weekend from June through August 2011, with the exception of the July 4 holiday weekend. One or two bridges were replaced each weekend during the construction time frame. The project was part of the commonwealth's Accelerated Bridge Program.
Off exit 43 (formerly 46) in Methuen, the surface level traffic circle was rebuilt as part of an overall infrastructure improvement that also included constructing a new bridge carrying the Interstate over the local road, reconstructing on- and offramps to the highway, and realigning the Interstate itself.
As originally envisioned by the federal government, I-93 would have followed the route of present US 3/Northwest Expressway/Everett Turnpike from Boston to Concord. By 1956, the two states had drawn up new plans for I-93 to the east, bypassing the tolled Everett Turnpike from Manchester southward along a new alignment, known as the "Northern Expressway" in Massachusetts and crossing into New Hampshire in Salem. The New Hampshire section south of Hooksett would be named the Alan B. Shepard Highway, named for the first American in space, a Derry native.
The first part of I-93 completed in New Hampshire opened in Salem from the Massachusetts border to exit 2 (NH 38/NH 97) in August 1961. The route was extended gradually northward over the next several years, reaching exit 3 (NH 111) by the end of 1961, as well as a second segment from the I-293/NH 101 west interchange to exit 7 (NH 101 east) at the same time. The two segments were connected in late 1962. This left a gap in I-93, as traffic was directed along NH 101 West and the Everett Turnpike, while the southern segment of I-93 continued on and ended in a stub at exit 7.
By 1963, the route had been completed from the end of the Everett Turnpike section, through Concord and north to Tilton (exit 20), and to NH 104 in New Hampton by 1964 (exit 23) and to Plymouth by 1965 (exit 26), and from there gradually northward until it reached the southern end of Franconia Notch. By 1977, I-93 was completed between exit 7 and the Everett Turnpike in Hooksett, completing the Alan B. Shepard Highway segment of I-93 and closing the gap that had stood for 15 years. The Everett Turnpike section had been built in 1957 and incorporated into I-93 in 1958. After the completion of the Alan B. Shepard Highway portion, the portion concurrent with NH 101 was widened to eight lanes, while the Everett Turnpike section from Hooksett to Concord was widened to six lanes in 1978.
A small segment was also completed from the northern end of Franconia Notch to Littleton prior to 1984, with the final stretch from Littleton to the Vermont border completed by 1984. This left a gap through Franconia Notch, with traffic directed along US 3 between the two sections. For years, debates over how to minimize environmental impact on the road through the notch prevented it being built. As a compromise the Franconia Notch Parkway, a super-two roadway with 45-mile-per-hour (72 km/h) speed limit, was completed in June 1988, replacing US 3. Originally, this road was not included in I-93, as it had its own exit numbers and was signed "TO I-93", though, later, the parkway was officially added to the Interstate System despite the substandard conditions and the exits renumbered. The parkway opened in June 1988, replacing Route 3, and grade crossings were replaced by an overpass.
Begun in 2006 and continuing until 2021, the portion between the state border and the I-293 southern terminus was widened to eight lanes; this necessitated the rebuilding and/or relocation of several interchanges. An additional exit has been proposed near milemarker 13 that would include a new connector road to NH 28, effectively bypassing downtown Derry and relieving traffic along NH 102 at exit 4. Construction began in 2023.
Construction of I-93 in Vermont was completed in 1982. It was planned to be built longer if I-91 did not change its designation eastward in the northeastern part of the state. It was the last Interstate to be built in the state.
Since 1996, the Massachusetts Highway Department (MassHighway) has studied rebuilding the interchange of I-93 and I-95 in Woburn along the border with Stoneham and Reading. The project was expected to start in early 2017 and cost $267 million but continued community opposition has postponed the project indefinitely. A project to upgrade the interchange of I-93 and I-95 in Canton is also proposed.
An additional 2010 proposal to upgrade Route 24, running southwards from I-93 exit 4 in Randolph to I-195 near Fall River, has also been put off due to studies showing the cost of the project being very high.
MassDOT and its predecessor MassHighway have planned on widening I-93 to a uniform four travel lanes in both directions from the lane drop near exit 35 (formerly 41) in Wilmington to the New Hampshire border since the beginning of the 2000s. The first section of widening will be done as part of the I-93 Tri-Town Interchange Project. The project will construct a new interchange in Wilmington. I-93 will be widened from three to four lanes in each direction from exit 35 (formerly 41) to I-495, a distance of approximately 5 miles (8 km), as the first phase in widening I-93 from exit 35 (formerly 41) to the New Hampshire state line. Early estimates of the entire project place the cost at $567 million.
New Hampshire plans
Initial plans to widen I-93 to a uniform four travel lanes in both directions from Salem to Manchester beginning in 2008 were put on hold due to a lawsuit designed to force the New Hampshire Department of Transportation (NHDOT) to update the plans to include other transportation options. Under orders from the US District Court, NHDOT and the US Department of Transportation (USDOT) were required to provide an updated environmental review. The Conservation Law Foundation (CLF) filed a lawsuit in February 2006, hoping to force any expansion plans in the area to include the restoration of commuter rail service between Manchester and Boston. Despite the suit, the exit 1 interchange construction was allowed to undergo upgrading and expansion; other associated projects related to the widening, chiefly around exits 3 and 5, were also eventually allowed to proceed. The whole set of projects were eventually allowed to move forward following an agreement between the state and the CLF that removed the group's opposition to construction which does not pose a threat to the environment.
As part of the 2009 stimulus package, New Hampshire was set to receive several million dollars in highway construction funds. One of the projects was the widening of a portion of I-93 between the Massachusetts border and Manchester. Bidding was set to begin in February 2009, with construction slated to begin in late 2009 or early 2010. The plans called for NHDOT to widen the southernmost 20 miles (32 km) of I-93 to four lanes in each direction, from the existing two lanes in each direction. In addition, all five interchanges along this length would be upgraded to accommodate larger amounts of traffic, including the replacement of many aging bridges. According to plans filed by the state with USDOT, the project was scheduled to run from 2009 through 2016, with work starting at the Massachusetts line and moving northward to Manchester. The project was designed with an intermodal transit bent; new or improved park and ride facilities were deployed at exits 1, 3, and 5, and a widened median strip was designed to accommodate a planned commuter rail service between Boston and Manchester. As a way to help defray the costs of the expansion, in early 2010, NHDOT made a formal request to the Federal Highway Administration to add tolls to I-93 at the Massachusetts–New Hampshire border. The new toll facility was to be located in Salem, approximately 0.5 miles (0.8 km) north of the state line, and would cost travelers $2.00 per vehicle. The proposal faced opposition from state legislators in both states, who claimed the tolls would cause severe congestion in the area and lead to an economic burden to local residents. Opponents included US senator Scott Brown. The proposal was eventually dropped in favor of issuing new state bonds to pay for expansion. The new policy was laid out by Transportation Commissioner George Campbell after reviewing the proposal and receiving a promise from the Massachusetts Department of Transportation that it would not be enacting a similar toll on the Massachusetts side of the border.
Plans were announced in 2012 that I-93 would receive new northbound and southbound bridges over I-89 in Bow. To reduce traffic on the southbound bridge, NHDOT added a third lane to ease congestion. The bridges were completed in 2014.
More plans were announced in 2014 that the Hooksett rest areas would be rebuilt. The new rest areas feature a 14-pump Irving Oil gas station, a new New Hampshire liquor and wine outlet, and a few restaurants and shops. The project was completed in 2015.
In Londonderry, a new interchange on I-93 connecting to the adjacent town of Derry were in final planning stages as of June 2020. Construction of exit 4A, to be located approximately a mile (1.6 km) north of exit 4 in Londonderry, began in 2022 and is scheduled to be completed in fall 2024. The interchange is part of a larger series of road improvements expected to be completed in 2026.
Massachusetts converted from sequential to distance-based exit numbering on I-93 in mid-2021. New Hampshire continues to use sequential exit numbering on all of its freeways except at interstate-to-interstate interchanges, which are usually unnumbered (exit 15E to I-393 is an exception to this convention). Vermont added "milepoint exit" numbers to existing signs in 2020, essentially marking each interchange with two exit numbers (except the I-91 interchange, which was previously unnumbered)..
|km||Old exit||New exit||Destinations||Notes|
I-95 / Route 128 north / US 1 south – Dedham, Portsmouth, New Hampshire, Providence, Rhode Island
|Signed as exits 1A (south) and 1B (north); southern terminus of US 1 concurrency; exit 26 (former exit 12) on I-95; southern terminus of Route 128|
|1.415||2.277||64||2||Route 138 – Stoughton, Milton||Signed as exits 2A (south) and 2B (north)|
|Milton||2.615||4.208||65||3||Ponkapoag Trail – Houghton's Pond|
Route 24 south – Brockton, Fall River
|Left exit southbound; northern terminus of Route 24; exit 41A-B on Route 24|
|4.233||6.812||67||5||Route 28 – Randolph, Milton||Signed as exits 5A (south) and 5B (north)|
|Braintree||6.450||10.380||68||6||Route 37 – West Quincy, Braintree, Holbrook||Northern terminus of Route 37|
Route 3 south – Braintree, Cape Cod
|Braintree Split; left exit southbound; southern terminus of Route 3 concurrency; former southern terminus of Route 128|
|South end of the Southeast Expressway|
|Quincy||8.182||13.168||–||8||Furnace Brook Parkway – Quincy|
|–||9||Adams Street – Milton, North Quincy|
Bryant Avenue – West Quincy
|10.134||16.309||–||10||Squantum Street – Milton||Southbound exit only|
To Route 203 / Granite Avenue – Ashmont, East Milton
|Signed as exits 11A (south) and 11B (north) southbound; no northbound access to/from southbound Granite Avenue|
Route 3A south – Neponset, Quincy
|No northbound exit|
|12.456||20.046||13||13A||Freeport Street – Dorchester||Northbound exit only|
|12.728||20.484||14||13B||Morrissey Boulevard – Savin Hill||Northbound exit and southbound entrance; commercial vehicles and buses prohibited|
|14.343||23.083||15||14||Columbia Road – Dorchester, South Boston|
|14.820||23.850||16||15A||Southampton Street – Andrew Square||Northbound exit and southbound entrance|
|17||–||Frontage Road||Former northbound exit removed during Big Dig reconstruction|
|18||15B||Frontage Road / Massachusetts Avenue – Roxbury, Andrew Square||Southbound entrance via exit 16; southbound exit signed as exit 15|
|19||–||East Berkeley Street / Broadway / Albany Street||Closed as part of Big Dig reconstruction|
|North end of the Southeast Expressway, south end of the John F. Fitzgerald Expressway|
I-90 Toll / Mass Pike – Logan Airport, Worcester, South Station
|Northbound signage; exits 134A/C on I-90.|
|–||—||South Station / Airport||Northbound left exit and southbound left entrance; former HOV-only exit until April 2021|
|South end of the Thomas P. O'Neill Jr. Tunnel|
|17.253||27.766||22, 20A/B||16A||South Station||Southbound signage|
I-90 Toll / Mass Pike west / Albany Street
|Southbound signage; exit 134B on I-90|
|21||–||Kneeland Street – Chinatown||Former southbound exit and northbound entrance; closed during Big Dig reconstruction|
|16.694||26.866||22||–||Surface Road – Chinatown||Southbound entrance only|
|17.340||27.906||23||17||Government Center||Northbound exit and southbound entrance via North Street|
|17.487||28.143||16B||Purchase Street||Southbound exit and entrance only|
|17.874||28.765||24A||17A||Government Center||Southbound exit and northbound entrance via Cross Street|
Route 1A north (Callahan Tunnel) – Airport
|Southbound exit and northbound entrance|
|North end of the Thomas P. O'Neill Jr. Tunnel|
|25||–||Causeway Street – North Station / Haymarket Square / Government Center||Closed as part of Big Dig reconstruction|
|Leonard P. Zakim Bunker Hill Memorial Bridge over the Charles River|
|17.892||28.794||26||18||Storrow Drive||Route 3 north – Cambridge; northbound signage; northern terminus of concurrency with Route 3|
Route 28 / Route 3 north – Leverett Circle, Cambridge, Storrow Drive
|Leverett Connector / North Station; southbound signage|
|Charlestown High Bridge over the Charles River (demolished 2004 as part of Big Dig reconstruction; existed west of current alignment)|
US 1 north (Tobin Bridge) – Revere
|Northbound left exit and southbound entrance; northern terminus of concurrency with US 1|
|North end of the John F. Fitzgerald Expressway|
To Route 99 – Sullivan Square, Somerville
|Northbound exit only, partially in Boston|
|20.415||32.855||Sullivan Square, Charlestown, Assembly Square||Southbound exit and northbound entrance|
Route 28 / Route 38 north – Somerville, Medford
|Northbound signage; southern terminus of Route 38|
|Medford||21.323||34.316||Route 38 – Medford, Somerville||Southbound signage|
Route 16 west (Mystic Valley Parkway) – Arlington
Route 16 east – Everett, Revere
|22.554||36.297||32||23||Route 60 – Medford, Malden||Also to Route 16 southbound; to Tufts University's Medford/Somerville Campus|
|23.229||37.383||33||24||Route 28 (Fellsway West) – Winchester||Roosevelt Circle|
Route 28 north – Stoneham, Melrose
|Northbound exit and southbound entrance|
|26.087||41.983||35||26||Park Street – Stoneham, Melrose||Southbound exit and northbound entrance|
|Woburn||26.929||43.338||36||27||Montvale Avenue – Stoneham, Woburn|
|Reading||28.476||45.828||37A-B||28A-B||I-95 / Route 128 – Peabody, Waltham||Split into exits 28A (north) and 28B (south); exits 55A-B on I-95 / Route 128|
|Woburn||29.965||48.224||37C||30||Commerce Way / Atlantic Avenue – Anderson RTC|
|Wilmington||31.136||50.109||38||31||Route 129 – Reading, Wilmington|
|32.635||52.521||39||33||Concord Street – Wilmington|
|34.064||54.821||40||34||Route 62 – North Reading, Wilmington|
|34.629||55.730||41||35||Route 125 – Andover, North Andover|
|Essex||Andover||37.682||60.643||42||38||Dascomb Road – Tewksbury, Andover|
|39.196||63.080||43||39||Route 133 – Andover, North Tewksbury||Signed as exits 39A (east) and 39B (west) southbound|
|40.521||65.212||44||40||I-495 – Lawrence, Lowell||Split into exits 40A (north) and 40B (south); exits 97A-B on I-495|
|42.423||68.273||45||42||River Road – South Lawrence|
|Merrimack River||43.139||69.425||General Edward D. Sirois Memorial Bridge|
|Methuen||43.465||69.950||46||43||Route 110 / Route 113 – Lawrence, Dracut||Interchange rebuilt in 2017; signed as exits 43A (east) and 43B (west) northbound)|
Route 213 east (Loop Connector) – Methuen, Haverhill
|Western terminus of Route 213; exits 1A/1B on Route 213|
|Massachusetts–New Hampshire line|
Rockingham Park Boulevard to NH 28 / NH 38 – Salem
|Access to The Mall at Rockingham Park and Tuscan Village; Originally northbound exit, southbound entrance only|
To NH 38 / NH 97 – Pelham, Salem
|Windham||5.821||9.368||3||NH 111 – Windham, North Salem|
|Londonderry||11.341||18.252||4||NH 102 – Derry, Londonderry|
To Folsom Road / NH 28 – Derry
|Under construction, expected completion in fall of 2024|
|15.291||24.608||5||NH 28 – North Londonderry|
I-293 north / NH 101 west – Manchester, Bedford
|Southern terminus of I-293; southern end of NH 101 concurrency; to Manchester-Boston Regional Airport|
|20.591||33.138||6||Candia Road, Hanover Street||Northbound entrance to NH 101 east only; southbound exit from I-93 only|
NH 101 east – Portsmouth, Seacoast
|Northern end of NH 101 concurrency|
Wellington Road, Bridge Street to NH 28A
|Merrimack||Hooksett||23.922||38.499||9||US 3 / NH 28 – Hooksett, Manchester||Split into exits 9N (north) and 9S (south)|
|25.727||41.404||10||NH 3A – Hooksett|
I-293 south / Everett Turnpike south – Manchester, Nashua, Manchester Airport
|Northern terminus of I-293; southern end of Everett Turnpike concurrency; last northbound exit before toll|
|28.659||46.122||Hooksett Main Toll Plaza|
|28.751||46.270||11||NH 3A – Hooksett||Hooksett Ramp Toll Plaza|
I-89 north – Lebanon, White River Junction VT
|Southern terminus of I-89; last southbound exit before toll|
NH 3A (South Main Street) to I-89 – Bow Junction
|Split into exits 12S (south) and 12N (north)|
|37.331||60.078||13||US 3 (Manchester Street) – Downtown Concord|
|38.454||61.886||14|| NH 9 (Loudon Road) – State Offices|
Everett Turnpike ends
|Northern terminus of Everett Turnpike|
I-393 east / US 4 east / US 202 east – Loudon, Portsmouth
|Western terminus of I-393; southern terminus of concurrency with US 4|
US 202 west to US 3 (North Main Street)
|40.188||64.676||16||NH 132 – East Concord|
US 4 west to US 3 / NH 132 – Penacook, Boscawen
|Northern terminus of concurrency with US 4; signed as exits 17W and 17E going southbound|
To NH 132 – Canterbury
|Northfield||54.976||88.475||19||NH 132 – Northfield, Franklin||Northbound exit and southbound entrance|
US 3 / NH 11 to NH 132 / NH 140 – Tilton, Laconia
|NH 132 / NH 140 signed without "To" northbound|
|Sanbornton||61.159||98.426||22||NH 127 – Sanbornton, West Franklin|
|New Hampton||69.229||111.413||23||NH 104 / NH 132 – Meredith, New Hampton|
|Grafton||Ashland||75.308||121.196||24||US 3 / NH 25 – Ashland, Holderness|
|Holderness||79.992||128.735||25||NH 175A (Holderness Road) – Plymouth||Access to Plymouth State University|
US 3 / NH 25 / NH 3A south – Plymouth, Rumney
|Northern terminus of Route 3A|
To US 3 – Blair Bridge, West Campton
NH 49 to NH 175 – Campton, Waterville Valley
|Thornton||88.542||142.495||29||US 3 – Thornton|
|Woodstock||94.400||151.922||30||US 3 – Woodstock, Thornton|
Tripoli Road to NH 175
|100.499||161.737||32||NH 112 – Lincoln, North Woodstock|
|Lincoln||102.538||165.019||33||US 3 – North Woodstock, North Lincoln|
|South end of the Franconia Notch Parkway|
US 3 south – Flume Gorge, Park Information Center
|Southern terminus of concurrency with US 3; No southbound entrance|
|Franconia||110.158||177.282||2||34B||Cannon Mountain Tramway – Old Man Historic Site|
NH 18 north – Echo Lake Beach, Peabody Slopes, Cannon Mountain
|Southern terminus of NH 18|
|111.401||179.283||North end of the Franconia Notch Parkway|
US 3 north – Twin Mountain, Lancaster
|Northern terminus of concurrency with US 3; northbound exit and southbound entrance|
NH 141 to US 3 – Twin Mountain, South Franconia
|115.946||186.597||37||NH 18 / NH 142 – Franconia, Bethlehem||Northbound exit and southbound entrance|
|116.728||187.856||38||NH 18 / NH 116 / NH 117 / NH 142 – Franconia, Sugar Hill||NH 142 not signed northbound|
|Bethlehem||119.295||191.987||39||NH 18 / NH 116 – North Franconia, Sugar Hill||Southbound exit and northbound entrance|
|120.777||194.372||40||US 302 / NH 18 – Bethlehem, Twin Mountain|
|Littleton||122.418||197.013||41||NH 116 – Littleton, Whitefield|
US 302 / NH 10 to NH 18 – Littleton, Woodsville
NH 135 to NH 18 – Littleton, Dalton
|130.355||209.786||44||NH 18 / NH 135 – Monroe, Waterford, VT|
|Senator Andrew Poulsen Bridge|
New Hampshire–Vermont line
VT 18 to US 2 – St. Johnsbury, Lower Waterford, East St. Johnsbury
|11.104||17.870||–||11||I-91 – St. Johnsbury, White River Junction||Signed as exits 11A (south) and 11B (north); exit 128 on I-91|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- Manchester, New Hampshire—I-293: The southernmost portion of this highway, between I-93 and the Everett Turnpike, was once known as Interstate 193.
- Concord, New Hampshire—I-393
- Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved December 12, 2022.
- "Hazardous material route designation". Mass.gov. Retrieved January 15, 2018.
- Google (June 8, 2009). "Interstate 93" (Map). Google Maps. Google. Retrieved June 8, 2009.
- "Methuen Rotary Project: Major Milestone Reached". MassDOT Blog. Massachusetts Department of Transportation. Archived from the original on October 21, 2020. Retrieved October 22, 2020.
- "The Central Artery/Tunnel Project - The Big Dig - Facts & Figures". Massachusetts Department of Transportation. Archived from the original on June 13, 2011. Retrieved September 25, 2014.
- "Alps' Roads I-93 Photos". Alps' Roads. Retrieved November 18, 2012.[self-published source]
- "Traffic Counts for Rte. I-93". Massachusetts Highway Department. Archived from the original on July 21, 2009. Retrieved September 14, 2008.
- "Traffic Counts for Rte. 1 & I-93". Massachusetts Highway Department. Archived from the original on February 10, 2012. Retrieved September 14, 2008.
- "Alan B Shepard Highway (I-93)". Retrieved September 25, 2014.
- "Salem-Manchester 10418-C | Project Specific Information | Project Center". New Hampshire Department of Transportation. Retrieved April 29, 2021.
- "The Successor Railroads". Thomas Crane Library. Archived from the original on March 5, 2016. Retrieved September 12, 2017.
- "Review Begins After Big Dig Tunnel Collapse". CNN. July 12, 2006. Archived from the original on July 15, 2006. Retrieved July 25, 2006.
- "Northern Expressway (I-93)". Retrieved October 4, 2014.[self-published source]
- Moskowitz, Eric (August 4, 2010). "Officials expect I-93 north lanes in Medford to be open for a.m. commute". Boston Globe. Retrieved August 5, 2010.
- Johnston, Louis; Williamson, Samuel H. (2023). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved January 1, 2023. United States Gross Domestic Product deflator figures follow the Measuring Worth series.
- "I-93 Medford Bridges: 93Fast14 Video". Massachusetts Department of Transportation. May 5, 2011. Archived from the original on June 18, 2011. Retrieved June 20, 2011.
- "MassDot Accelerated Bridge Program: About the program". Massachusetts Department of Transportation. Archived from the original on June 8, 2011. Retrieved June 20, 2011.
- Kashinsky, Leah (December 21, 2017). "MassDOT: 'Majority of construction' complete at former Methuen rotary". The Eagle-Tribune. North Andover, Massachusetts.
- "Alan B. Shepard Highway Historic Overview". Boston Roads. Retrieved June 8, 2021.[self-published source]
- "Parkway dedicated in Franconia Notch". The Boston Globe. June 3, 1988. p. 18. Retrieved January 22, 2022 – via Newspapers.com.
- Weingroff, Richard F. (Summer 1996). "Dwight D. Eisenhower System of Interstate and Defense Highways Engineering Marvels". Public Roads. Federal Highway Administration. Retrieved January 22, 2022.
- "I-93". AA Roads. Retrieved June 8, 2021.[self-published source]
- "$755 million I-93 expansion project now complete". WMUR. September 10, 2021. Retrieved December 9, 2021.
- "Vermont @ AARoads - Interstate 93". www.aaroads.com. Retrieved May 22, 2017.[self-published source]
- "Everett Turnpike (US 3, I-293, and I-93)". www.bostonroads.com. Retrieved May 22, 2017.[self-published source]
- "I-93\I-95 Interchange Transportation Study". Archived from the original on February 27, 2009. Retrieved October 4, 2014.
- "Woburn–Reading–Stoneham–Wakefield– Interchange Improvements to I-93/I-95". Archived from the original on June 16, 2013.
- "I-93/Lowell Junction Development Area Background". Archived from the original on July 2, 2014. Retrieved October 4, 2014.
- Anderson, Steve. "Northern Expressway". BostonRoads.com. Retrieved May 22, 2010.[self-published source]
- James Vaznis (August 31, 2007). "I-93 widening in N.H. set back". The Boston Globe. Retrieved October 14, 2007.
- Davidson, Kate (August 24, 2008). "I-93 projects move forward, not sideways". Concord Monitor.
- John Distaso (February 18, 2009). "NH hustles for its slice of stimulus pie". New Hampshire Union Leader. MSNBC. Archived from the original on February 20, 2009. Retrieved February 20, 2009.
The biggest project on its list, the $31 million widening of Interstate 93 from Salem to Manchester, will be advertised on Feb. 24, Jannelle said.
- New Hampshire Department of Transportation. "Rebuilding 93:Salem to Manchester – Project background". New Hampshire Department of Transportation DOT. Archived from the original on August 29, 2009. Retrieved August 23, 2009.
- Date, Terry (February 23, 2010). "NH, Massachusetts lawmakers speak against I-93 toll". Eagle-Tribune. Retrieved May 22, 2010.
- Landrigan, Kevin (March 20, 2010). "Tolls nixed to pay for I-93 widening". Nashua Telegraph. Retrieved May 22, 2010.
- New Hampshire Department of Transportation. "I93 Exit 4A Project". New Hampshire Department of Transportation. Retrieved June 24, 2020.
- "I-93 Corridor". MassDOT Exit Numbering. Archived from the original on October 23, 2021. Retrieved October 23, 2021.
- "Vermont Exit Numbering". Vermont Agency of Transportation.
- Planning Division. "Massachusetts Route Log Application". Massachusetts Department of Transportation. Archived from the original on August 26, 2014. Retrieved August 23, 2014.
- Bureau of Planning & Community Assistance (February 20, 2015). "NH Public Roads". Concord: New Hampshire Department of Transportation. Retrieved April 7, 2015.
- Traffic Research Unit (May 2013). "2012 (Route Log) AADTs for State Highways" (PDF). Vermont Agency of Transportation. Retrieved March 7, 2015.
- Bureau of Planning & Community Assistance (April 3, 2015). "Nodal Reference 2015, State of New Hampshire". New Hampshire Department of Transportation. Retrieved April 7, 2015.[permanent dead link]
- Town of Salem, Rockingham County[permanent dead link]
- Town of Windham, Rockingham County[permanent dead link]
- Town of Londonderry, Rockingham County[permanent dead link]
- City of Manchester, Hillsborough County[permanent dead link]
- Town of Hooksett, Merrimack County[permanent dead link]
- Town of Bow, Merrimack County[permanent dead link]
- Town of Canterbury, Merrimack County[permanent dead link]
- Town of Northfield, Merrimack County[permanent dead link]
- Town of Tilton, Belknap County[permanent dead link]
- Town of Sanbornton, Belknap County[permanent dead link]
- Town of New Hampton, Belknap County[permanent dead link]
- Town of Ashland, Grafton County[permanent dead link]
- Town of Holderness, Grafton County[permanent dead link]
- Town of Plymouth, Grafton County[permanent dead link]
- Town of Campton, Grafton County[permanent dead link]
- Town of Thornton, Grafton County[permanent dead link]
- Town of Woodstock, Grafton County[permanent dead link]
- Town of Lincoln, Grafton County[permanent dead link]
- Town of Franconia, Grafton County[permanent dead link]
- Town of Bethlehem, Grafton County[permanent dead link]
- Town of Littleton, Grafton County[permanent dead link]
- Massachusetts Department of Transportation. "Exit Numbers and Names: Route I-93 (Canton to Route US 1)". Archived from the original on August 26, 2014. Retrieved August 23, 2014.
- Massachusetts Department of Transportation. "Exit Numbers and Names: Route I-93 (Route US 1 to Methuen)". Archived from the original on August 26, 2014. Retrieved August 23, 2014.
- Massachusetts Department of Transportation. "About the Bypass Road and Logan/Route 1A Express Lane pilot project". Archived from the original on October 23, 2018. Retrieved April 13, 2021.
- Google (October 2013). "MA-3, Boston, Massachusetts". Google Street View. Google. Retrieved August 23, 2014.
- "Methuen Rotary Project: Home". Massachusetts Department of Transportation. Archived from the original on September 3, 2016. Retrieved December 8, 2012.
- Media related to Interstate 93 at Wikimedia Commons