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The highway system of the United States is a network of interconnected state, U.S., and Interstate highways. Each of the fifty states, the District of Columbia, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands, and the U.S. Virgin Islands own and maintain a part of this vast system, including U.S. and Interstate highways, which are not owned or maintained at the federal level.

I-10 shield
I-510 shield

Interstate Highways have the highest speed limits and the highest traffic numbers. Interstates are numbered in a grid: even-numbered routes for east–west routes (with the lowest numbers along Mexico and the Gulf of Mexico), and odd-numbered routes are north–south routes (with the lowest numbers along the Pacific Ocean). Three-digit Interstates are, generally, either beltways or spurs of their parent Interstates (for example, Interstate 510 is a spur into the city of New Orleans, Louisiana, and is connected to Interstate 10).

US 2 shield
US 202 shield

U.S. Numbered Highways are the original interstate highways, dating back to 1926. U.S. Highways are also numbered in a grid: even numbered for east–west routes (with the lowest numbers along Canada) and odd numbered for north–south routes (with the lowest numbers along the Atlantic Ocean). Three-digit highways, also known as "child routes," are branches off their main one- or two-digit "parents" (for example, U.S. Route 202 is a branch of U.S. Route 2). However, US 101, rather than a "child" of US 1, is considered a "mainline" U.S. Route.

Generic state highway 9 marker
Marker for State Traffic Route 18 in Pennsylvania

State highways are the next level in the hierarchy. Each state and territory has its own system for numbering highways, some more systematic than others. Each state also has its own design for its highway markers; the number in a circle is the default sign, but many choose a different design connected to the state, such as an outline of the state with the number inside. Many states also operate a system of county highways.

National Scenic Byway marker
National Forest Scenic Byway marker

Scenic byways can be designated over any classification of road in the United States. There are the National Scenic Byways, National Forest Scenic Byways and Bureau of Land Management Back Country Byways at the national level. Most states have their own system for designating byways, some more systematic than others. Native American tribes may designate byways as well.

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  • Image 1 New York State Route 343 (NY 343) is a state highway located entirely within central Dutchess County, in the Hudson Valley region of the U.S. state of New York. It runs east–west from the intersection of NY 82 in the village of Millbrook to the town of Amenia, where it crosses the Connecticut state line and continues eastward as Route 343, a Connecticut state highway located entirely within the town of Sharon. Along the way, it has a 7.3-mile (11.7 km) concurrency with NY 22 from vicinity of the hamlet of Dover Plains to the hamlet of Amenia. The entirety of modern Route 343 was originally the Dover branch of the Dutchess Turnpike. The turnpike, which was in operation from the early to the mid-19th century, was a major transportation route at the time, connecting several local communities to Litchfield County, Connecticut, and the city of Poughkeepsie. NY 343 was designated in 1930, connecting the hamlet of Amenia to the state line, but was relocated a few years later onto the portion of New York State Route 200 from South Millbrook to the hamlet of Dover Plains. The NY 200 designation was rerouted east of Millbrook on NY 343's original alignment. NY 343 absorbed NY 200 in the early 1940s, creating an overlap with NY 22 between Dover Plains and Amenia. The Connecticut portion of the highway was originally designated as part of Route 4; it was renumbered to Route 343 in 1932. (Full article...)
    New York State Route 343 (NY 343) is a state highway located entirely within central Dutchess County, in the Hudson Valley region of the U.S. state of New York. It runs east–west from the intersection of NY 82 in the village of Millbrook to the town of Amenia, where it crosses the Connecticut state line and continues eastward as Route 343, a Connecticut state highway located entirely within the town of Sharon. Along the way, it has a 7.3-mile (11.7 km) concurrency with NY 22 from vicinity of the hamlet of Dover Plains to the hamlet of Amenia.

    The entirety of modern Route 343 was originally the Dover branch of the Dutchess Turnpike. The turnpike, which was in operation from the early to the mid-19th century, was a major transportation route at the time, connecting several local communities to Litchfield County, Connecticut, and the city of Poughkeepsie. NY 343 was designated in 1930, connecting the hamlet of Amenia to the state line, but was relocated a few years later onto the portion of New York State Route 200 from South Millbrook to the hamlet of Dover Plains. The NY 200 designation was rerouted east of Millbrook on NY 343's original alignment. NY 343 absorbed NY 200 in the early 1940s, creating an overlap with NY 22 between Dover Plains and Amenia. The Connecticut portion of the highway was originally designated as part of Route 4; it was renumbered to Route 343 in 1932. (Full article...)
  • Image 2 U.S. Highway 30 (US 30) is a major east–west U.S. Highway which spans 330 miles (530 km) across the state of Iowa. It is the longest primary highway in the state and is maintained by the Iowa Department of Transportation (Iowa DOT). The route in Iowa begins at the Missouri River crossing at Blair, Nebraska, and ends at the Mississippi River crossing at Clinton, Iowa. Along the way, it serves Denison and Carroll in western Iowa, Boone, Ames, and Marshalltown in central Iowa, and Tama, Cedar Rapids, and DeWitt in eastern Iowa. Cutting across the central portion of the state, US 30 runs within close proximity of the Union Pacific Railroad's Overland Route for its entire length. US 30 was conceived as a part of the Lincoln Highway, the first transcontinental highway in the United States. A route through Iowa was chosen because of the important link between Omaha, Nebraska, and Chicago, Illinois. As the U.S. Highway System came into being in the 1920s, and the Lincoln Highway became US 30, federal money started to pay for paving Iowa's dirt roads. By 1931, the route had been paved across the entire state. (Full article...)
    U.S. Highway 30 (US 30) is a major east–west U.S. Highway which spans 330 miles (530 km) across the state of Iowa. It is the longest primary highway in the state and is maintained by the Iowa Department of Transportation (Iowa DOT). The route in Iowa begins at the Missouri River crossing at Blair, Nebraska, and ends at the Mississippi River crossing at Clinton, Iowa. Along the way, it serves Denison and Carroll in western Iowa, Boone, Ames, and Marshalltown in central Iowa, and Tama, Cedar Rapids, and DeWitt in eastern Iowa. Cutting across the central portion of the state, US 30 runs within close proximity of the Union Pacific Railroad's Overland Route for its entire length.

    US 30 was conceived as a part of the Lincoln Highway, the first transcontinental highway in the United States. A route through Iowa was chosen because of the important link between Omaha, Nebraska, and Chicago, Illinois. As the U.S. Highway System came into being in the 1920s, and the Lincoln Highway became US 30, federal money started to pay for paving Iowa's dirt roads. By 1931, the route had been paved across the entire state. (Full article...)
  • Image 3 Interstate 70 (I-70) is a transcontinental Interstate Highway in the United States, stretching from Cove Fort, Utah, to Baltimore, Maryland. In Colorado, the highway traverses an east–west route across the center of the state. In western Colorado, the highway connects the metropolitan areas of Grand Junction and Denver via a route through the Rocky Mountains. In eastern Colorado, the highway crosses the Great Plains, connecting Denver with metropolitan areas in Kansas and Missouri. Bicycles and other non-motorized vehicles, normally prohibited on Interstate Highways, are allowed on those stretches of I-70 in the Rockies where no other through route exists. The United States Department of Transportation (USDOT) lists the construction of I-70 among the engineering marvels undertaken in the Interstate Highway System and cites four major accomplishments: the section through the Dakota Hogback, Eisenhower Tunnel, Vail Pass, and Glenwood Canyon. The Eisenhower Tunnel, with a maximum elevation of 11,158 feet (3,401 m) and length of 1.7 miles (2.7 km), is the longest mountain tunnel and highest point along the Interstate Highway System. The portion through Glenwood Canyon was completed on October 14, 1992. This was one of the final pieces of the Interstate Highway System to open to traffic and is one of the most expensive rural highways per mile built in the country. The Colorado Department of Transportation (CDOT) earned the 1993 Outstanding Civil Engineering Achievement Award from the American Society of Civil Engineers for the completion of I-70 through the canyon. (Full article...)
    Interstate 70 (I-70) is a transcontinental Interstate Highway in the United States, stretching from Cove Fort, Utah, to Baltimore, Maryland. In Colorado, the highway traverses an east–west route across the center of the state. In western Colorado, the highway connects the metropolitan areas of Grand Junction and Denver via a route through the Rocky Mountains. In eastern Colorado, the highway crosses the Great Plains, connecting Denver with metropolitan areas in Kansas and Missouri. Bicycles and other non-motorized vehicles, normally prohibited on Interstate Highways, are allowed on those stretches of I-70 in the Rockies where no other through route exists.

    The United States Department of Transportation (USDOT) lists the construction of I-70 among the engineering marvels undertaken in the Interstate Highway System and cites four major accomplishments: the section through the Dakota Hogback, Eisenhower Tunnel, Vail Pass, and Glenwood Canyon. The Eisenhower Tunnel, with a maximum elevation of 11,158 feet (3,401 m) and length of 1.7 miles (2.7 km), is the longest mountain tunnel and highest point along the Interstate Highway System. The portion through Glenwood Canyon was completed on October 14, 1992. This was one of the final pieces of the Interstate Highway System to open to traffic and is one of the most expensive rural highways per mile built in the country. The Colorado Department of Transportation (CDOT) earned the 1993 Outstanding Civil Engineering Achievement Award from the American Society of Civil Engineers for the completion of I-70 through the canyon. (Full article...)
  • Image 4 State Route 94 (SR 94) is a state highway in the U.S. state of California that is 63.324 miles (101.910 km) long. The western portion, known as the Martin Luther King Jr. Freeway, begins at Interstate 5 (I-5) in downtown San Diego and continues to the end of the freeway portion past SR 125 in Spring Valley. The non-freeway segment of SR 94 that continues east through the mountains to I-8 near Boulevard is known as Campo Road. The Campo road served as a wagon road providing access to eastern San Diego County as well as Imperial County. The road was added to the state highway system in 1933, and signs for Route 94 were posted along local roads later that decade. Efforts to convert the western half of the route to a freeway got underway in the 1950s, and the freeway was complete by 1962 west of the road that became SR 125. Construction continued east to Avocado Road over the next few years. Various proposals for widening the highway have come from the California Department of Transportation (Caltrans), but local opposition resulted in the delay or cancellation of many of these proposals. (Full article...)
    State Route 94 (SR 94) is a state highway in the U.S. state of California that is 63.324 miles (101.910 km) long. The western portion, known as the Martin Luther King Jr. Freeway, begins at Interstate 5 (I-5) in downtown San Diego and continues to the end of the freeway portion past SR 125 in Spring Valley. The non-freeway segment of SR 94 that continues east through the mountains to I-8 near Boulevard is known as Campo Road.

    The Campo road served as a wagon road providing access to eastern San Diego County as well as Imperial County. The road was added to the state highway system in 1933, and signs for Route 94 were posted along local roads later that decade. Efforts to convert the western half of the route to a freeway got underway in the 1950s, and the freeway was complete by 1962 west of the road that became SR 125. Construction continued east to Avocado Road over the next few years. Various proposals for widening the highway have come from the California Department of Transportation (Caltrans), but local opposition resulted in the delay or cancellation of many of these proposals. (Full article...)
  • Image 5 Interstate 496 (I-496) is an auxiliary Interstate Highway that passes through downtown Lansing in the US state of Michigan. Also a component of the State Trunkline Highway System, the freeway connects I-96 to the downtown area. It has been named the R.E. Olds Freeway (sometimes just Olds Freeway) for Ransom E. Olds, the founder of Oldsmobile and the REO Motor Car Company. I-496 runs east–west from I-96/I-69 near the downtown area and north–south along a section that runs concurrently with US Highway 127 (US 127). The trunkline also passes a former assembly plant used by Oldsmobile and runs along or crosses parts of the Grand and Red Cedar rivers. Construction of I-496 started in 1963, and the freeway opened on December 18, 1970. Segments of the freeway south of downtown Lansing were built in the location of a historically black neighborhood. This neighborhood was formed based on the segregationist practices of the early 20th century. Community leaders worked for different housing opportunities for the black residents displaced by I-496 rather than fight the freeway. As the trunkline neared completion, competing proposals to name it resulted in two similar, but separate designations applied to I-496. The city originally approved one name in honor of a former mayor. The local historical society proposed that the state name it as a memorial to Olds after the demolition of the Olds Mansion. The city renamed it the Oldsmobile Expressway, the name under which it opened in December 1970. Two years later, the Michigan Legislature restored its preferred name and it has been the Olds Freeway since. (Full article...)
    Interstate 496 (I-496) is an auxiliary Interstate Highway that passes through downtown Lansing in the US state of Michigan. Also a component of the State Trunkline Highway System, the freeway connects I-96 to the downtown area. It has been named the R.E. Olds Freeway (sometimes just Olds Freeway) for Ransom E. Olds, the founder of Oldsmobile and the REO Motor Car Company. I-496 runs east–west from I-96/I-69 near the downtown area and north–south along a section that runs concurrently with US Highway 127 (US 127). The trunkline also passes a former assembly plant used by Oldsmobile and runs along or crosses parts of the Grand and Red Cedar rivers.

    Construction of I-496 started in 1963, and the freeway opened on December 18, 1970. Segments of the freeway south of downtown Lansing were built in the location of a historically black neighborhood. This neighborhood was formed based on the segregationist practices of the early 20th century. Community leaders worked for different housing opportunities for the black residents displaced by I-496 rather than fight the freeway. As the trunkline neared completion, competing proposals to name it resulted in two similar, but separate designations applied to I-496. The city originally approved one name in honor of a former mayor. The local historical society proposed that the state name it as a memorial to Olds after the demolition of the Olds Mansion. The city renamed it the Oldsmobile Expressway, the name under which it opened in December 1970. Two years later, the Michigan Legislature restored its preferred name and it has been the Olds Freeway since. (Full article...)
  • Image 6 Interstate 70 (I-70) is a mainline route of the Interstate Highway System in the United States connecting Utah and Maryland. The Utah section runs east–west for approximately 232 miles (373 km) across the central part of the state. Richfield is the largest Utah city served by the freeway, which does not serve or connect any urban areas in the state. The freeway was built as part of a system of highways connecting Los Angeles and the Northeastern United States. I-70 was the second attempt to connect southern California to the east coast of the United States via central Utah, the first being a failed attempt to construct a transcontinental railroad. Parts of that effort were reused in the laying out of the route of I-70. Unlike most Interstate Highways, much of I-70 in Utah was not constructed parallel to or on top of an existing U.S. Route. Portions of I-70 were constructed in areas where previously there were no paved roads. Because it was built over an entirely new route, I-70 has many features that are unique in the Interstate Highway System. For example, the 110 miles (180 km) between Green River and Salina makes up the longest distance anywhere in the Interstate Highway System with no motorist services. This same piece is noted as the longest highway in the United States built over a completely new route since the Alaska Highway, and the longest piece of Interstate Highway to open at a given time. The construction of the Utah portion of I-70 is listed as one of the engineering marvels of the Interstate Highway System. (Full article...)
    Interstate 70 (I-70) is a mainline route of the Interstate Highway System in the United States connecting Utah and Maryland. The Utah section runs east–west for approximately 232 miles (373 km) across the central part of the state. Richfield is the largest Utah city served by the freeway, which does not serve or connect any urban areas in the state. The freeway was built as part of a system of highways connecting Los Angeles and the Northeastern United States. I-70 was the second attempt to connect southern California to the east coast of the United States via central Utah, the first being a failed attempt to construct a transcontinental railroad. Parts of that effort were reused in the laying out of the route of I-70.

    Unlike most Interstate Highways, much of I-70 in Utah was not constructed parallel to or on top of an existing U.S. Route. Portions of I-70 were constructed in areas where previously there were no paved roads. Because it was built over an entirely new route, I-70 has many features that are unique in the Interstate Highway System. For example, the 110 miles (180 km) between Green River and Salina makes up the longest distance anywhere in the Interstate Highway System with no motorist services. This same piece is noted as the longest highway in the United States built over a completely new route since the Alaska Highway, and the longest piece of Interstate Highway to open at a given time. The construction of the Utah portion of I-70 is listed as one of the engineering marvels of the Interstate Highway System. (Full article...)
  • Image 7 US Highway 141 (US 141) is a north–south United States Numbered Highway in the states of Wisconsin and Michigan. The highway runs north-northwesterly from an interchange with Interstate 43 (I-43) in Bellevue, Wisconsin, near Green Bay, to a junction with US 41/M-28 near Covington, Michigan. In between, it follows city streets in Green Bay and has a concurrent section with US 41 in Wisconsin. North of Green Bay, US 141 is either a freeway or an expressway into rural northern Wisconsin before downgrading to an undivided highway. In Michigan, US 141 is an undivided highway that runs through rural woodlands. The highway has two segments in each state; after running through Wisconsin for about 103 miles (166 km), it crosses into Michigan for approximately another eight miles (13 km). After that, it crosses back into Wisconsin for about 14+1⁄2 miles (23 km) before crossing the state line one last time. The northernmost Michigan section is about 43+1⁄2 miles (70 km), making the overall length about 169 miles (272 km). When the US Highway System was formed on November 11, 1926, US 141 ran from Milwaukee to Green Bay, and one segment of the modern highway in Michigan was originally designated US Highway 102 (US 102). This other designation was decommissioned in 1928 when US 141 was extended north from Green Bay into Michigan. Michigan has rebuilt the highway in stages over the years to smooth out sharp curves in the routing. Since the 1960s, the section south of Green Bay has been converted into a freeway in segments. US 141 has ended southeast of Green Bay in Bellevue since the 1980s—the southern freeway segment was redesignated as I-43. The section north of Abrams, Wisconsin, was converted to a freeway in the opening years of the 21st century, with an additional divided-highway section opening a few years later. (Full article...)
    US Highway 141 (US 141) is a north–south United States Numbered Highway in the states of Wisconsin and Michigan. The highway runs north-northwesterly from an interchange with Interstate 43 (I-43) in Bellevue, Wisconsin, near Green Bay, to a junction with US 41/M-28 near Covington, Michigan. In between, it follows city streets in Green Bay and has a concurrent section with US 41 in Wisconsin. North of Green Bay, US 141 is either a freeway or an expressway into rural northern Wisconsin before downgrading to an undivided highway. In Michigan, US 141 is an undivided highway that runs through rural woodlands. The highway has two segments in each state; after running through Wisconsin for about 103 miles (166 km), it crosses into Michigan for approximately another eight miles (13 km). After that, it crosses back into Wisconsin for about 14+1⁄2 miles (23 km) before crossing the state line one last time. The northernmost Michigan section is about 43+1⁄2 miles (70 km), making the overall length about 169 miles (272 km).

    When the US Highway System was formed on November 11, 1926, US 141 ran from Milwaukee to Green Bay, and one segment of the modern highway in Michigan was originally designated US Highway 102 (US 102). This other designation was decommissioned in 1928 when US 141 was extended north from Green Bay into Michigan. Michigan has rebuilt the highway in stages over the years to smooth out sharp curves in the routing. Since the 1960s, the section south of Green Bay has been converted into a freeway in segments. US 141 has ended southeast of Green Bay in Bellevue since the 1980s—the southern freeway segment was redesignated as I-43. The section north of Abrams, Wisconsin, was converted to a freeway in the opening years of the 21st century, with an additional divided-highway section opening a few years later. (Full article...)
  • Image 8 U.S. Highway 8 (US 8) is a United States Numbered Highway that runs primarily east–west for 280 miles (451 km), mostly within the state of Wisconsin. It connects Interstate 35 (I-35) in Forest Lake, Minnesota, to US 2 at Norway, Michigan. Except for the short freeway segment near Forest Lake, a section near the St. Croix River bridge, the interchange with US 51, and a three-mile (4.8 km) stretch west of Rhinelander, Wisconsin, it is mostly an undivided surface road. As a state highway in the three states, US 8 is maintained by the Minnesota, Wisconsin and Michigan departments of transportation (MnDOT, WisDOT, and MDOT, respectively). The highway was originally commissioned on November 11, 1926, with the rest of the original U.S. Highway System. At the time, it ran between Forest Lake, Minnesota, and Pembine, Wisconsin, with a planned continuation to Powers, Michigan. Several changes have been made to the routing of the highway since then. The western end was extended south to Minneapolis before it was truncated back to Forest Lake. Other changes on the east end have moved that terminus from the originally planned end location at Powers to the current location in Norway. Internal WisDOT and MDOT map files at various times have shown plans to reroute the highway to connect to the original planned 1926 terminus. US 8's course through the three states has also been shifted to follow different alignments over the years. (Full article...)
    U.S. Highway 8 (US 8) is a United States Numbered Highway that runs primarily east–west for 280 miles (451 km), mostly within the state of Wisconsin. It connects Interstate 35 (I-35) in Forest Lake, Minnesota, to US 2 at Norway, Michigan. Except for the short freeway segment near Forest Lake, a section near the St. Croix River bridge, the interchange with US 51, and a three-mile (4.8 km) stretch west of Rhinelander, Wisconsin, it is mostly an undivided surface road. As a state highway in the three states, US 8 is maintained by the Minnesota, Wisconsin and Michigan departments of transportation (MnDOT, WisDOT, and MDOT, respectively).

    The highway was originally commissioned on November 11, 1926, with the rest of the original U.S. Highway System. At the time, it ran between Forest Lake, Minnesota, and Pembine, Wisconsin, with a planned continuation to Powers, Michigan. Several changes have been made to the routing of the highway since then. The western end was extended south to Minneapolis before it was truncated back to Forest Lake. Other changes on the east end have moved that terminus from the originally planned end location at Powers to the current location in Norway. Internal WisDOT and MDOT map files at various times have shown plans to reroute the highway to connect to the original planned 1926 terminus. US 8's course through the three states has also been shifted to follow different alignments over the years. (Full article...)
  • Image 9 Business M-28 (Bus. M-28) is a state trunkline highway serving as a business route that runs for approximately 4.9 miles (7.9 km) through the downtown districts of Ishpeming and Negaunee in the US state of Michigan. The trunkline provides a marked route for traffic diverting from U.S. Highway 41 (US 41) and M-28 through the two historic iron-mining communities. It is one of three business loops for M-numbered highways in the state of Michigan. There have previously been two other Bus. M-28 designations for highways in Newberry and Marquette. The trunkline was originally a section of US 41/M-28 and M-35. Before the 1930s, the main highways ran through the two downtown areas when US 41/M-28 was relocated to run near Teal Lake. The former routing had various names over the years. It was designated as an alternate route of the main highways, using both the US 41A/M-28A and Alt. US 41/Alt. M-28 designations before it was designated as Bus. M-28 in 1958. M-35 continued to run through downtown Negaunee along a section of the highway until the 1960s. A rerouting in 1999 moved the trunkline designation along Lakeshore Drive in Ishpeming, and a streetscape project rebuilt the road in Negaunee in 2005. (Full article...)
    Business M-28 (Bus. M-28) is a state trunkline highway serving as a business route that runs for approximately 4.9 miles (7.9 km) through the downtown districts of Ishpeming and Negaunee in the US state of Michigan. The trunkline provides a marked route for traffic diverting from U.S. Highway 41 (US 41) and M-28 through the two historic iron-mining communities. It is one of three business loops for M-numbered highways in the state of Michigan. There have previously been two other Bus. M-28 designations for highways in Newberry and Marquette.

    The trunkline was originally a section of US 41/M-28 and M-35. Before the 1930s, the main highways ran through the two downtown areas when US 41/M-28 was relocated to run near Teal Lake. The former routing had various names over the years. It was designated as an alternate route of the main highways, using both the US 41A/M-28A and Alt. US 41/Alt. M-28 designations before it was designated as Bus. M-28 in 1958. M-35 continued to run through downtown Negaunee along a section of the highway until the 1960s. A rerouting in 1999 moved the trunkline designation along Lakeshore Drive in Ishpeming, and a streetscape project rebuilt the road in Negaunee in 2005. (Full article...)
  • Image 10 State Route 520 (SR 520) is a state highway and freeway in the Seattle metropolitan area, part of the U.S. state of Washington. It runs 13 miles (21 km) from Seattle in the west to Redmond in the east. The freeway connects Seattle to the Eastside region of King County via the Evergreen Point Floating Bridge on Lake Washington. SR 520 intersects several state highways, including Interstate 5 (I-5) in Seattle, I-405 in Bellevue, and SR 202 in Redmond. The original floating bridge was opened in 1963 as a replacement for the cross-lake ferry system that had operated since the late 19th century. In 1964, SR 520 was designated as a freeway connecting I-5 to I-405. An extension to Redmond was proposed later in the decade. In the 1970s and 1980s, sections of the freeway between Bellevue and Redmond were opened to traffic, replacing the temporary designation of SR 920. (Full article...)
    State Route 520 (SR 520) is a state highway and freeway in the Seattle metropolitan area, part of the U.S. state of Washington. It runs 13 miles (21 km) from Seattle in the west to Redmond in the east. The freeway connects Seattle to the Eastside region of King County via the Evergreen Point Floating Bridge on Lake Washington. SR 520 intersects several state highways, including Interstate 5 (I-5) in Seattle, I-405 in Bellevue, and SR 202 in Redmond.

    The original floating bridge was opened in 1963 as a replacement for the cross-lake ferry system that had operated since the late 19th century. In 1964, SR 520 was designated as a freeway connecting I-5 to I-405. An extension to Redmond was proposed later in the decade. In the 1970s and 1980s, sections of the freeway between Bellevue and Redmond were opened to traffic, replacing the temporary designation of SR 920. (Full article...)
  • Image 11 Interstate 470 (I-470) is a 10.63-mile-long (17.11 km) auxiliary Interstate Highway of I-70 that bypasses the city of Wheeling, West Virginia, United States. I-470 is one of 13 auxiliary Interstate Highways in Ohio and the only auxiliary Interstate Highway in West Virginia. The western terminus of I-470 is an interchange with I-70 in Richland Township, Ohio. Traveling southeast through rural Belmont County, I-470 approaches the Vietnam Veterans Memorial Bridge, which spans the Ohio River. After crossing the river into Ohio County, West Virginia, the highway continues east toward the Wheeling communities of Bethlehem and Elm Grove and its eastern terminus at I-70 near Elm Grove. The portion of the highway in West Virginia is named the USS West Virginia Memorial Highway by proclamation of then-Governor Cecil H. Underwood on the 59th anniversary of the attack on Pearl Harbor. Construction of the freeway began in 1975 in the two states. Due to a chronic lack of funding, construction in Ohio was stalled between 1976 and 1981. After a $0.033-per-US-gallon ($0.040/imp gal; $0.0087/L) fuel tax increase, Ohio was able to restart construction, and, by 1983, both states had completed construction on the freeway. The three-level diamond interchange with concurrent highways U.S. Route 250 (US 250) and West Virginia Route 2 (WV 2) on the eastern banks of the Ohio River was thought to be the most complex interchange in West Virginia's Interstate Highway System at the time of construction. On average, between 25,500 and 37,840 vehicles use the highway daily. (Full article...)
    Interstate 470 (I-470) is a 10.63-mile-long (17.11 km) auxiliary Interstate Highway of I-70 that bypasses the city of Wheeling, West Virginia, United States. I-470 is one of 13 auxiliary Interstate Highways in Ohio and the only auxiliary Interstate Highway in West Virginia. The western terminus of I-470 is an interchange with I-70 in Richland Township, Ohio. Traveling southeast through rural Belmont County, I-470 approaches the Vietnam Veterans Memorial Bridge, which spans the Ohio River. After crossing the river into Ohio County, West Virginia, the highway continues east toward the Wheeling communities of Bethlehem and Elm Grove and its eastern terminus at I-70 near Elm Grove. The portion of the highway in West Virginia is named the USS West Virginia Memorial Highway by proclamation of then-Governor Cecil H. Underwood on the 59th anniversary of the attack on Pearl Harbor.

    Construction of the freeway began in 1975 in the two states. Due to a chronic lack of funding, construction in Ohio was stalled between 1976 and 1981. After a $0.033-per-US-gallon ($0.040/imp gal; $0.0087/L) fuel tax increase, Ohio was able to restart construction, and, by 1983, both states had completed construction on the freeway. The three-level diamond interchange with concurrent highways U.S. Route 250 (US 250) and West Virginia Route 2 (WV 2) on the eastern banks of the Ohio River was thought to be the most complex interchange in West Virginia's Interstate Highway System at the time of construction. On average, between 25,500 and 37,840 vehicles use the highway daily. (Full article...)
  • Image 12 Brockway Mountain Drive is an 8.8-mile-long (14.2 km) scenic roadway just west of Copper Harbor in the Upper Peninsula of Michigan in the United States. Drivers can access the road from State Highway M-26 on either end near Eagle Harbor to the west or Copper Harbor to the east in the Keweenaw Peninsula. The drive runs along the ridge of Brockway Mountain on the Keweenaw Fault and climbs to 1,320 feet (402 m) above sea level, 720 feet (219 m) above the surface of Lake Superior. Several viewpoints along the route allow for panoramas of Copper Harbor, Lake Superior, and undeveloped woodland. On a clear day, Isle Royale is visible approximately 50 miles (80 km) in distance from the top of the mountain. Brockway Mountain was named for Daniel D. Brockway, one of the pioneer residents of the area. The road was constructed by the county road commission with funding through Depression-era work programs in 1933. It was briefly used as a connection for the parallel state highway after it opened. Since it opened, Brockway Mountain Drive has been recognized nationally and locally in several media outlets for its picturesque qualities, usually in profiles of Keweenaw County, the Upper Peninsula or other scenic drives. (Full article...)
    A graphic representation of the brown wooden sign for Brockway Mountain Drive

    Brockway Mountain Drive is an 8.8-mile-long (14.2 km) scenic roadway just west of Copper Harbor in the Upper Peninsula of Michigan in the United States. Drivers can access the road from State Highway M-26 on either end near Eagle Harbor to the west or Copper Harbor to the east in the Keweenaw Peninsula. The drive runs along the ridge of Brockway Mountain on the Keweenaw Fault and climbs to 1,320 feet (402 m) above sea level, 720 feet (219 m) above the surface of Lake Superior. Several viewpoints along the route allow for panoramas of Copper Harbor, Lake Superior, and undeveloped woodland. On a clear day, Isle Royale is visible approximately 50 miles (80 km) in distance from the top of the mountain.

    Brockway Mountain was named for Daniel D. Brockway, one of the pioneer residents of the area. The road was constructed by the county road commission with funding through Depression-era work programs in 1933. It was briefly used as a connection for the parallel state highway after it opened. Since it opened, Brockway Mountain Drive has been recognized nationally and locally in several media outlets for its picturesque qualities, usually in profiles of Keweenaw County, the Upper Peninsula or other scenic drives. (Full article...)
  • Image 13 I-8 in San Diego, from the San Diego Trolley Interstate 8 (I-8) is an Interstate Highway in the southwestern United States. It runs from the southern edge of Mission Bay at Sunset Cliffs Boulevard in San Diego, California, almost at the Pacific Ocean, to the junction with I-10, just southeast of Casa Grande, Arizona. In California, the freeway travels through the San Diego metropolitan area as the Ocean Beach Freeway and the Mission Valley Freeway before traversing the Cuyamaca Mountains and providing access through the Imperial Valley, including the city of El Centro. Crossing the Colorado River into Arizona, I-8 continues through the city of Yuma across the Sonoran Desert to Casa Grande, in between the cities of Phoenix and Tucson. The first route over the Cuyamaca Mountains was dedicated in 1912, and a plank road served as the first road across the Imperial Valley to Yuma; east of there, the Gila Trail continued east to Gila Bend. These were later replaced by U.S. Route 80 (US 80) across California and part of Arizona, and Arizona State Route 84 (SR 84) between Gila Bend and Casa Grande. The US 80 freeway through San Diego was largely complete by the time it was renumbered as I-8 in the 1964 state highway renumbering; east of San Diego, the US 80 roadway was slowly replaced by I-8 as construction progressed in the Imperial Valley. The Arizona portion of the road was built starting in the 1960s. Several controversies erupted during the construction process; questionable labor practices in Imperial County led to the federal conviction of mobster Jimmy Fratianno, and a U.S. House of Representatives subcommittee found that the Arizona government had mismanaged financial resources. (Full article...)
    I-8 in San Diego, from the San Diego Trolley

    Interstate 8 (I-8) is an Interstate Highway in the southwestern United States. It runs from the southern edge of Mission Bay at Sunset Cliffs Boulevard in San Diego, California, almost at the Pacific Ocean, to the junction with I-10, just southeast of Casa Grande, Arizona. In California, the freeway travels through the San Diego metropolitan area as the Ocean Beach Freeway and the Mission Valley Freeway before traversing the Cuyamaca Mountains and providing access through the Imperial Valley, including the city of El Centro. Crossing the Colorado River into Arizona, I-8 continues through the city of Yuma across the Sonoran Desert to Casa Grande, in between the cities of Phoenix and Tucson.

    The first route over the Cuyamaca Mountains was dedicated in 1912, and a plank road served as the first road across the Imperial Valley to Yuma; east of there, the Gila Trail continued east to Gila Bend. These were later replaced by U.S. Route 80 (US 80) across California and part of Arizona, and Arizona State Route 84 (SR 84) between Gila Bend and Casa Grande. The US 80 freeway through San Diego was largely complete by the time it was renumbered as I-8 in the 1964 state highway renumbering; east of San Diego, the US 80 roadway was slowly replaced by I-8 as construction progressed in the Imperial Valley. The Arizona portion of the road was built starting in the 1960s. Several controversies erupted during the construction process; questionable labor practices in Imperial County led to the federal conviction of mobster Jimmy Fratianno, and a U.S. House of Representatives subcommittee found that the Arizona government had mismanaged financial resources. (Full article...)
  • Image 14 Interstate 69 (I-69) is a part of the Interstate Highway System that will eventually run from the Mexican border in Texas to the Canadian border at Port Huron, Michigan. In Michigan, it is a state trunkline highway that enters the state south of Coldwater and passes the cities of Lansing and Flint in the Lower Peninsula. A north–south freeway from the Indiana–Michigan border to the Lansing area, it changes direction to east–west after running concurrently with I-96. The freeway continues to Port Huron before terminating in the middle of the twin-span Blue Water Bridge while running concurrently with I-94 at the border. There are four related business loops for I-69 in the state, connecting the freeway to adjacent cities. Predecessors to I-69 include the first M-29, US Highway 27 (US 27), M-78 and M-21. The freeway was not included on the original Interstate Highway System planning maps in the mid-1950s, but it was added in 1958 along a shorter route. Michigan built segments of freeway for the future Interstate in the 1960s, and the state was granted additional Interstate mileage in 1968 to extend I-69 north and east to Flint. Later extensions in 1973 and 1987 resulted in the modern-day highway. The first freeway segment designated as I-69 in Michigan opened in 1967, and the last was completed in 1992, finishing Michigan's Interstate System. US 27 previously ran concurrently with I-69 from the Indiana–Michigan state line north to the Lansing area, but this designation was removed in 2002. (Full article...)
    Interstate 69 (I-69) is a part of the Interstate Highway System that will eventually run from the Mexican border in Texas to the Canadian border at Port Huron, Michigan. In Michigan, it is a state trunkline highway that enters the state south of Coldwater and passes the cities of Lansing and Flint in the Lower Peninsula. A north–south freeway from the Indiana–Michigan border to the Lansing area, it changes direction to east–west after running concurrently with I-96. The freeway continues to Port Huron before terminating in the middle of the twin-span Blue Water Bridge while running concurrently with I-94 at the border. There are four related business loops for I-69 in the state, connecting the freeway to adjacent cities.

    Predecessors to I-69 include the first M-29, US Highway 27 (US 27), M-78 and M-21. The freeway was not included on the original Interstate Highway System planning maps in the mid-1950s, but it was added in 1958 along a shorter route. Michigan built segments of freeway for the future Interstate in the 1960s, and the state was granted additional Interstate mileage in 1968 to extend I-69 north and east to Flint. Later extensions in 1973 and 1987 resulted in the modern-day highway. The first freeway segment designated as I-69 in Michigan opened in 1967, and the last was completed in 1992, finishing Michigan's Interstate System. US 27 previously ran concurrently with I-69 from the Indiana–Michigan state line north to the Lansing area, but this designation was removed in 2002. (Full article...)
  • Image 15 The Atlantic City–Brigantine Connector (officially the Atlantic City Expressway Connector; also known as the Atlantic City Connector or Brigantine Connector) is a connector freeway in Atlantic City, New Jersey, United States. It is a 2.37-mile (3.81 km) extension of the Atlantic City Expressway, connecting it to New Jersey Route 87, which leads into Brigantine via the Marina district of Atlantic City. Locally, the freeway is known as "the Tunnel", due to the tunnel along its route that passes underneath the Westside neighborhood. The connector is a state highway owned and operated by the South Jersey Transportation Authority (SJTA); it has an unsigned designation of Route 446X. Proposals for a similar connector road in Atlantic City date to 1964; planning began in 1995 after businessman Steve Wynn proposed a new casino in the Marina district. The goals were to reduce traffic on Atlantic City streets and improve access to the Marina district and Brigantine. It was supported by Governor Christine Todd Whitman and Mayor Jim Whelan, but faced major opposition during its planning. Residents whose homes were to be destroyed for the tunnel construction fought the project, and competing casino owner Donald Trump filed lawsuits to prevent its construction. (Full article...)
    The Atlantic City–Brigantine Connector (officially the Atlantic City Expressway Connector; also known as the Atlantic City Connector or Brigantine Connector) is a connector freeway in Atlantic City, New Jersey, United States. It is a 2.37-mile (3.81 km) extension of the Atlantic City Expressway, connecting it to New Jersey Route 87, which leads into Brigantine via the Marina district of Atlantic City. Locally, the freeway is known as "the Tunnel", due to the tunnel along its route that passes underneath the Westside neighborhood. The connector is a state highway owned and operated by the South Jersey Transportation Authority (SJTA); it has an unsigned designation of Route 446X.

    Proposals for a similar connector road in Atlantic City date to 1964; planning began in 1995 after businessman Steve Wynn proposed a new casino in the Marina district. The goals were to reduce traffic on Atlantic City streets and improve access to the Marina district and Brigantine. It was supported by Governor Christine Todd Whitman and Mayor Jim Whelan, but faced major opposition during its planning. Residents whose homes were to be destroyed for the tunnel construction fought the project, and competing casino owner Donald Trump filed lawsuits to prevent its construction. (Full article...)
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  • Image 1 State Highway 74, usually abbreviated as SH-74 or OK-74 (or simply Highway 74) is the numbering of two different highways maintained by the U.S. state of Oklahoma. These highways were once a single major north–south route, connecting Oklahoma City to more rural parts of the state. The original road stretched from SH-7 near Tatums to SH-11 west of Deer Creek. Due to encroaching Interstate highways—especially Interstate 35 (I-35)—the middle section of the route through Norman, Moore, and Oklahoma City was decommissioned in 1979 for reasons of redundancy. However, some maps show SH-74 as running concurrently with I-35, I-240, and I-44, thus linking the two sections. (Full article...)
    State Highway 74, usually abbreviated as SH-74 or OK-74 (or simply Highway 74) is the numbering of two different highways maintained by the U.S. state of Oklahoma. These highways were once a single major north–south route, connecting Oklahoma City to more rural parts of the state. The original road stretched from SH-7 near Tatums to SH-11 west of Deer Creek.

    Due to encroaching Interstate highways—especially Interstate 35 (I-35)—the middle section of the route through Norman, Moore, and Oklahoma City was decommissioned in 1979 for reasons of redundancy. However, some maps show SH-74 as running concurrently with I-35, I-240, and I-44, thus linking the two sections. (Full article...)
  • Image 2 Sierra Highway or El Camino Sierra is a road in Southern California, United States. El Camino Sierra refers to the full length of a trail formed in the 19th century, rebuilt as highways in the early 20th century, that ran from Los Angeles to Lake Tahoe following parts of modern State Route 14, U.S. Route 395 and State Route 89. Two portions of this road are currently signed as Sierra Highway. The first is an old alignment of SR 14/U.S. Route 6 from Los Angeles to Mojave. This road is also signed with the unusual designation of State Route 14U through the city of Santa Clarita. The second part signed as Sierra Highway is a portion of US 395 in Bishop. Traversing the extremes of California, from the Mojave Desert to the Sierra Nevada, El Camino Sierra has been advertised to the world as a highway to showcase the natural beauty of California as far back as 1910. Though most of Sierra Highway was bypassed in the early 1970s with freeways, the road is still well known. The portion through the San Gabriel Mountains is noted as the primary filming location for the film Duel. (Full article...)
    Sierra Highway or El Camino Sierra is a road in Southern California, United States. El Camino Sierra refers to the full length of a trail formed in the 19th century, rebuilt as highways in the early 20th century, that ran from Los Angeles to Lake Tahoe following parts of modern State Route 14, U.S. Route 395 and State Route 89. Two portions of this road are currently signed as Sierra Highway. The first is an old alignment of SR 14/U.S. Route 6 from Los Angeles to Mojave. This road is also signed with the unusual designation of State Route 14U through the city of Santa Clarita. The second part signed as Sierra Highway is a portion of US 395 in Bishop.

    Traversing the extremes of California, from the Mojave Desert to the Sierra Nevada, El Camino Sierra has been advertised to the world as a highway to showcase the natural beauty of California as far back as 1910. Though most of Sierra Highway was bypassed in the early 1970s with freeways, the road is still well known. The portion through the San Gabriel Mountains is noted as the primary filming location for the film Duel. (Full article...)
  • Image 3 Pennsylvania Route 12 (PA 12) is a 9.566-mile-long (15.395 km) state highway located in Berks County in eastern Pennsylvania. The western terminus of the route is at U.S. Route 222 (US 222) and US 422 in Wyomissing. Its eastern terminus is PA 662 in the community of Pricetown in Ruscombmanor Township. In the Reading area, PA 12 is a four-lane freeway called the Warren Street Bypass that heads northeast through urban areas, coming to interchanges with multiple roads including PA 183, PA 61, and US 222 Business (US 222 Bus.). In Alsace Township, the route becomes a two-lane undivided road with at-grade intersections called Pricetown Road and continues northeast through rural areas, intersecting PA 73 before ending at PA 662. Pricetown Road originally existed in the 18th century as a road to link farmers in Pricetown to markets in Reading. The Warren Street Bypass was first planned in 1949 as a widening of Warren Street in Reading leading to a new bridge over Tulpehocken Creek to Wyomissing. In the 1950s, the Warren Street Bypass was completed from Wyomissing northeast to US 222 (Allentown Pike, now 5th Street Highway) north of Reading, providing a bypass of Reading. US 222 was routed onto this bypass by 1976, with the Warren Street Bypass extended northeast to Pricetown Road in 1980. The part of the Warren Street Bypass northeast of US 222 along with Pricetown Road became State Route 2026 (SR 2026) when the Location Referencing System was established. In 1998, PA 12 was assigned to its current alignment following the rerouting of US 222 onto a new bypass of Reading. (Full article...)
    Pennsylvania Route 12 (PA 12) is a 9.566-mile-long (15.395 km) state highway located in Berks County in eastern Pennsylvania. The western terminus of the route is at U.S. Route 222 (US 222) and US 422 in Wyomissing. Its eastern terminus is PA 662 in the community of Pricetown in Ruscombmanor Township. In the Reading area, PA 12 is a four-lane freeway called the Warren Street Bypass that heads northeast through urban areas, coming to interchanges with multiple roads including PA 183, PA 61, and US 222 Business (US 222 Bus.). In Alsace Township, the route becomes a two-lane undivided road with at-grade intersections called Pricetown Road and continues northeast through rural areas, intersecting PA 73 before ending at PA 662.

    Pricetown Road originally existed in the 18th century as a road to link farmers in Pricetown to markets in Reading. The Warren Street Bypass was first planned in 1949 as a widening of Warren Street in Reading leading to a new bridge over Tulpehocken Creek to Wyomissing. In the 1950s, the Warren Street Bypass was completed from Wyomissing northeast to US 222 (Allentown Pike, now 5th Street Highway) north of Reading, providing a bypass of Reading. US 222 was routed onto this bypass by 1976, with the Warren Street Bypass extended northeast to Pricetown Road in 1980. The part of the Warren Street Bypass northeast of US 222 along with Pricetown Road became State Route 2026 (SR 2026) when the Location Referencing System was established. In 1998, PA 12 was assigned to its current alignment following the rerouting of US 222 onto a new bypass of Reading. (Full article...)
  • Image 4 Mississippi Highway 9W (MS 9W) is a 20.3-mile (32.7 km) long state highway located in northern Mississippi. The southern terminus of the route is at MS 9 north of Bruce in Calhoun County while the northern terminus is at MS 7 south of Oxford in Lafayette County. The route is a two-lane undivided road its entire length and passes through rural areas of woods and farms. Along the way, MS 9W intersects MS 315 in Paris. MS 9W was designated to follow its current alignment in 1956 and was fully paved from a gravel road by 1960. (Full article...)
    Mississippi Highway 9W (MS 9W) is a 20.3-mile (32.7 km) long state highway located in northern Mississippi. The southern terminus of the route is at MS 9 north of Bruce in Calhoun County while the northern terminus is at MS 7 south of Oxford in Lafayette County. The route is a two-lane undivided road its entire length and passes through rural areas of woods and farms. Along the way, MS 9W intersects MS 315 in Paris. MS 9W was designated to follow its current alignment in 1956 and was fully paved from a gravel road by 1960. (Full article...)
  • Image 5 State Route 363 (SR 363) is a short north–south state highway located in west-central Ohio. The southern terminus of this spur route is along the shores of Lake Loramie approximately two and a half miles (4.0 km) southeast of Minster, where the roadway becomes known as Lotus Road. The northern terminus of SR 363 is at a T-intersection with SR 119 about one mile (1.6 km) east of Minster. Created in the middle of the 1930s, this short highway, which exists in both Shelby and Auglaize counties, provides access from SR 119 to a small community of cottages situated on a peninsula that juts out from the north side of Lake Loramie. (Full article...)

    State Route 363 (SR 363) is a short north–south state highway located in west-central Ohio. The southern terminus of this spur route is along the shores of Lake Loramie approximately two and a half miles (4.0 km) southeast of Minster, where the roadway becomes known as Lotus Road. The northern terminus of SR 363 is at a T-intersection with SR 119 about one mile (1.6 km) east of Minster.

    Created in the middle of the 1930s, this short highway, which exists in both Shelby and Auglaize counties, provides access from SR 119 to a small community of cottages situated on a peninsula that juts out from the north side of Lake Loramie. (Full article...)
  • Image 6 Interstate 440 (I-440) is an east–west auxiliary Interstate Highway that runs through Nashville, Tennessee. It serves as a southern bypass around downtown Nashville, and is located on average about three miles (4.8 km) from the center of the city. I-440 is also known locally as the Four-Forty Parkway, and is designated as the Debra K. Johnson Memorial Parkway. At a length of 7.64 miles (12.30 km), I-440 runs between I-40 and I-24, and connects to I-65 and multiple U.S. Routes. Combined, I-440 and Briley Parkway, a controlled-access segment of State Route 155 (SR 155), form a noncontiguous inner beltway around downtown Nashville. Originally proposed in the 1950s, I-440 was the subject of much controversy related to its location and design, which resulted in multiple design changes and delayed the highway's completion for many years. As a result, it was the last segment of Interstate Highway planned for Tennessee by the Federal-Aid Highway Act of 1956 to be constructed. After its completion in 1987, I-440 developed unforeseen congestion, safety, and surface issues, which prompted a reconstruction of the entire route that was completed in 2020. (Full article...)
    Interstate 440 (I-440) is an east–west auxiliary Interstate Highway that runs through Nashville, Tennessee. It serves as a southern bypass around downtown Nashville, and is located on average about three miles (4.8 km) from the center of the city. I-440 is also known locally as the Four-Forty Parkway, and is designated as the Debra K. Johnson Memorial Parkway. At a length of 7.64 miles (12.30 km), I-440 runs between I-40 and I-24, and connects to I-65 and multiple U.S. Routes. Combined, I-440 and Briley Parkway, a controlled-access segment of State Route 155 (SR 155), form a noncontiguous inner beltway around downtown Nashville.

    Originally proposed in the 1950s, I-440 was the subject of much controversy related to its location and design, which resulted in multiple design changes and delayed the highway's completion for many years. As a result, it was the last segment of Interstate Highway planned for Tennessee by the Federal-Aid Highway Act of 1956 to be constructed. After its completion in 1987, I-440 developed unforeseen congestion, safety, and surface issues, which prompted a reconstruction of the entire route that was completed in 2020. (Full article...)
  • Image 7 Maryland Route 55 (MD 55) is a state highway in the U.S. state of Maryland. Known as Vale Summit Road, the state highway runs 2.53 miles (4.07 km) from MD 36 in Vale Summit north to U.S. Route 40 Alternate (US 40 Alt.) in Clarysville. MD 55 connects the La Vale area with Midland in the upper Georges Creek Valley in northwestern Allegany County. MD 55 was paved from Clarysville to Vale Summit around 1921 and extended south to Midland in the late 1930s. The southern terminus of the state highway was truncated at Vale Summit when MD 36 took over part of the highway for a new alignment in the early 1970s. (Full article...)
    Maryland Route 55 (MD 55) is a state highway in the U.S. state of Maryland. Known as Vale Summit Road, the state highway runs 2.53 miles (4.07 km) from MD 36 in Vale Summit north to U.S. Route 40 Alternate (US 40 Alt.) in Clarysville. MD 55 connects the La Vale area with Midland in the upper Georges Creek Valley in northwestern Allegany County. MD 55 was paved from Clarysville to Vale Summit around 1921 and extended south to Midland in the late 1930s. The southern terminus of the state highway was truncated at Vale Summit when MD 36 took over part of the highway for a new alignment in the early 1970s. (Full article...)
  • Image 8 U.S. Route 202 (US 202) is a US Highway running from New Castle, Delaware, northeast to Bangor, Maine. The southernmost section of the route in the U.S. state of Delaware passes through northern New Castle County. It runs from its southern terminus at an interchange with US 13/US 40 near the Wilmington Airport north to the Pennsylvania state line in Brandywine Hundred. The route passes east of the airport concurrent with Delaware Route 141 (DE 141) before coming to an interchange with Interstate 95 (I-95). At this point, US 202 heads northeast along with I-95 through Wilmington. Just north of Wilmington, US 202 splits from I-95 by running north on Concord Pike through the suburban Brandywine Hundred area to the Pennsylvania state line. US 202 is a multilane divided highway the entire length across Delaware, with the section concurrent with I-95 a freeway. The Concord Pike was originally chartered as the Wilmington and Great Valley Turnpike in 1811, a turnpike that was to connect Wilmington to Great Valley, Pennsylvania. The Concord Pike between US 13 in Wilmington and the Pennsylvania state line became a part of US 122 in 1926. In 1934, US 122 was renumbered to US 202 and the road was realigned to head southwest and end at US 13 and US 40 in State Road. In the 1950s, the Concord Pike north of Wilmington was widened into a divided highway. By 1954, US 202 was realigned to follow US 13 northbound and Washington Street southbound through downtown Wilmington. The southern terminus was cut back to I-295 in Farnhurst in 1964. In 1970, the south end of US 202 was truncated to the I-95 interchange north of Wilmington. DE 202 was designated along Concord Avenue in 1981. US 202 was extended south to its current terminus in 1984. (Full article...)
    U.S. Route 202 (US 202) is a US Highway running from New Castle, Delaware, northeast to Bangor, Maine. The southernmost section of the route in the U.S. state of Delaware passes through northern New Castle County. It runs from its southern terminus at an interchange with US 13/US 40 near the Wilmington Airport north to the Pennsylvania state line in Brandywine Hundred. The route passes east of the airport concurrent with Delaware Route 141 (DE 141) before coming to an interchange with Interstate 95 (I-95). At this point, US 202 heads northeast along with I-95 through Wilmington. Just north of Wilmington, US 202 splits from I-95 by running north on Concord Pike through the suburban Brandywine Hundred area to the Pennsylvania state line. US 202 is a multilane divided highway the entire length across Delaware, with the section concurrent with I-95 a freeway.

    The Concord Pike was originally chartered as the Wilmington and Great Valley Turnpike in 1811, a turnpike that was to connect Wilmington to Great Valley, Pennsylvania. The Concord Pike between US 13 in Wilmington and the Pennsylvania state line became a part of US 122 in 1926. In 1934, US 122 was renumbered to US 202 and the road was realigned to head southwest and end at US 13 and US 40 in State Road. In the 1950s, the Concord Pike north of Wilmington was widened into a divided highway. By 1954, US 202 was realigned to follow US 13 northbound and Washington Street southbound through downtown Wilmington. The southern terminus was cut back to I-295 in Farnhurst in 1964. In 1970, the south end of US 202 was truncated to the I-95 interchange north of Wilmington. DE 202 was designated along Concord Avenue in 1981. US 202 was extended south to its current terminus in 1984. (Full article...)
  • Image 9 New York State Route 146 (NY 146) is a state highway in the Capital District of New York in the United States. It extends for 43 miles (69 km) from Gallupville at NY 443 to near Mechanicville at U.S. Route 4 (US 4) and NY 32. NY 146 is a major thoroughfare in the city of Schenectady, just outside Albany. Most of the route follows an east–west alignment; however, the middle third of the route between Guilderland and Clifton Park runs in a more north–south manner in order to serve Schenectady. At one time, NY 146 had three spur routes; only one—NY 146A—still exists. NY 146 was assigned as part of the 1930 renumbering of state highways in New York. At the time, NY 146 began at modern NY 443 in Berne and followed what is now NY 156 northeast to Altamont while modern NY 146 west of Altamont was part of NY 156. The alignments of the two routes were flipped in the late 1930s. Other minor realignments have occurred since, most notably near Mechanicville. (Full article...)
    New York State Route 146 (NY 146) is a state highway in the Capital District of New York in the United States. It extends for 43 miles (69 km) from Gallupville at NY 443 to near Mechanicville at U.S. Route 4 (US 4) and NY 32. NY 146 is a major thoroughfare in the city of Schenectady, just outside Albany. Most of the route follows an east–west alignment; however, the middle third of the route between Guilderland and Clifton Park runs in a more north–south manner in order to serve Schenectady. At one time, NY 146 had three spur routes; only one—NY 146A—still exists.

    NY 146 was assigned as part of the 1930 renumbering of state highways in New York. At the time, NY 146 began at modern NY 443 in Berne and followed what is now NY 156 northeast to Altamont while modern NY 146 west of Altamont was part of NY 156. The alignments of the two routes were flipped in the late 1930s. Other minor realignments have occurred since, most notably near Mechanicville. (Full article...)
  • Image 10 New York State Route 9L (NY 9L) is a state highway in Warren County, New York, in the United States. The road is 18.58 miles (29.90 km) long and is a suffixed highway of U.S. Route 9 (US 9). NY 9L goes through three municipalities in Warren County: the city of Glens Falls, the town of Queensbury and the town of Lake George. It starts at an intersection with US 9 and NY 32 in Glens Falls and ends at a junction with US 9 and NY 9N in Lake George. NY 9L is a scenic route for people traveling to Lake George as the road provides many views of the lake. The route was assigned as part of the 1930 renumbering of state highways in New York along the path of an old military road originally built during the American Revolution. (Full article...)
    New York State Route 9L (NY 9L) is a state highway in Warren County, New York, in the United States. The road is 18.58 miles (29.90 km) long and is a suffixed highway of U.S. Route 9 (US 9). NY 9L goes through three municipalities in Warren County: the city of Glens Falls, the town of Queensbury and the town of Lake George. It starts at an intersection with US 9 and NY 32 in Glens Falls and ends at a junction with US 9 and NY 9N in Lake George. NY 9L is a scenic route for people traveling to Lake George as the road provides many views of the lake. The route was assigned as part of the 1930 renumbering of state highways in New York along the path of an old military road originally built during the American Revolution. (Full article...)
  • Image 11 M-97 is a state trunkline highway in the U.S. state of Michigan. It runs from Detroit to north of Mt. Clemens following Groesbeck Highway. The highway starts south of 7 Mile Road and runs northeasterly through Macomb County suburbs to Hall Road, which takes the place of 20 Mile Road in the Mile Road System. In between the termini, Groesbeck Highway runs through suburban residential and commercial areas. Groesbeck Highway is named after Alex Groesbeck, former Michigan governor and attorney-general. The road was constructed starting in the 1920s to provide traffic relief to Gratiot Avenue, which was the main route between Detroit and Mt. Clemens. It was created as a state trunkline to facilitate construction financing. The final extension was opened at a ribbon cutting ceremony in 1949. This ceremony also dedicated the entire roadway in the former governor's honor after sections were named for another politician by the state. (Full article...)
    M-97 is a state trunkline highway in the U.S. state of Michigan. It runs from Detroit to north of Mt. Clemens following Groesbeck Highway. The highway starts south of 7 Mile Road and runs northeasterly through Macomb County suburbs to Hall Road, which takes the place of 20 Mile Road in the Mile Road System. In between the termini, Groesbeck Highway runs through suburban residential and commercial areas.

    Groesbeck Highway is named after Alex Groesbeck, former Michigan governor and attorney-general. The road was constructed starting in the 1920s to provide traffic relief to Gratiot Avenue, which was the main route between Detroit and Mt. Clemens. It was created as a state trunkline to facilitate construction financing. The final extension was opened at a ribbon cutting ceremony in 1949. This ceremony also dedicated the entire roadway in the former governor's honor after sections were named for another politician by the state. (Full article...)
  • Image 12 North Carolina Highway 122 (NC 122) is a primary state highway in the U.S. state of North Carolina. The road has a southern terminus at NC 124 in Macclesfield and runs through rural areas to reach its northern terminus at NC 125 in Hobgood. The highway serves several smaller communities such as Speed and Pinetops, along with Tarboro, and intersects two U.S. Highways. NC 122 is primarily a two lane undivided road, except when the highways widens to a four-lane undivided road along Howard Avenue and Western Boulevard in Tarboro. The highway also becomes a six-lane divided highway during its concurrency with US 64. NC 122 first appeared in mid-1931 as a new routing running from NC 12 (present-day US 258) east of Tarboro to its current northern terminus at NC 125 in Hobgood. The route stayed the same until 1994 when it was extended to its current southern terminus in Macclesfield. (Full article...)
    North Carolina Highway 122 (NC 122) is a primary state highway in the U.S. state of North Carolina. The road has a southern terminus at NC 124 in Macclesfield and runs through rural areas to reach its northern terminus at NC 125 in Hobgood. The highway serves several smaller communities such as Speed and Pinetops, along with Tarboro, and intersects two U.S. Highways. NC 122 is primarily a two lane undivided road, except when the highways widens to a four-lane undivided road along Howard Avenue and Western Boulevard in Tarboro. The highway also becomes a six-lane divided highway during its concurrency with US 64.

    NC 122 first appeared in mid-1931 as a new routing running from NC 12 (present-day US 258) east of Tarboro to its current northern terminus at NC 125 in Hobgood. The route stayed the same until 1994 when it was extended to its current southern terminus in Macclesfield. (Full article...)
  • Image 13 M-122 was a state trunkline highway in the US state of Michigan entirely in the city of St. Ignace. The highway connected US Highway 2 (US 2) to the State Highway Ferry Dock used before the Mackinac Bridge was built. It was retired and the road returned to local control in 1957. (Full article...)
    M-122 was a state trunkline highway in the US state of Michigan entirely in the city of St. Ignace. The highway connected US Highway 2 (US 2) to the State Highway Ferry Dock used before the Mackinac Bridge was built. It was retired and the road returned to local control in 1957. (Full article...)
  • Image 14 Interstate 180 (I-180) is a short auxiliary Interstate Highway in Lincoln, Nebraska, United States. The north–south spur freeway connects I-80 to downtown Lincoln, running for 3.5 miles (5.6 km) while entirely concurrent to U.S. Route 34 (US 34). I-180 has two intermediate interchanges at Cornhusker Highway and Superior Street, both located north of Oak Creek. It is the only auxiliary interstate highway completely in the state of Nebraska. It was proposed in the 1950s and construction began in 1961 as part of the Lincoln Access Highway project. On 27 July 1963, the southern section between December 1963 and January 1964 underwent a two-phase opening after the northern section between Cornhusker Highway and I-80. The southern section, which includes a viaduct over a downtown railroad, was rebuilt from 1996 to 1998, while the Oak Creek crossing was rebuilt between 2001 and 2003. (Full article...)
    Interstate 180 (I-180) is a short auxiliary Interstate Highway in Lincoln, Nebraska, United States. The north–south spur freeway connects I-80 to downtown Lincoln, running for 3.5 miles (5.6 km) while entirely concurrent to U.S. Route 34 (US 34). I-180 has two intermediate interchanges at Cornhusker Highway and Superior Street, both located north of Oak Creek. It is the only auxiliary interstate highway completely in the state of Nebraska.

    It was proposed in the 1950s and construction began in 1961 as part of the Lincoln Access Highway project. On 27 July 1963, the southern section between December 1963 and January 1964 underwent a two-phase opening after the northern section between Cornhusker Highway and I-80. The southern section, which includes a viaduct over a downtown railroad, was rebuilt from 1996 to 1998, while the Oak Creek crossing was rebuilt between 2001 and 2003. (Full article...)
  • Image 15 New York State Route 402 (NY 402) was a state highway located within the village of Tivoli in Dutchess County, New York, in the United States. It was assigned in the early 1930s and served as a connector between NY 9G and what was once a ferry landing on the Hudson River west of the village. Although the ferry service linking Tivoli and the village of Saugerties was shut down in the 1940s, NY 402 continued to exist until 1980. On April 1 of that year, ownership and maintenance of the highway was transferred to Dutchess County as part of a highway maintenance swap between the county and the state of New York. The highway became part of an extended County Route 78 (CR 78), which had begun at the junction of NY 9G and NY 402 prior to the swap. (Full article...)
    New York State Route 402 (NY 402) was a state highway located within the village of Tivoli in Dutchess County, New York, in the United States. It was assigned in the early 1930s and served as a connector between NY 9G and what was once a ferry landing on the Hudson River west of the village. Although the ferry service linking Tivoli and the village of Saugerties was shut down in the 1940s, NY 402 continued to exist until 1980. On April 1 of that year, ownership and maintenance of the highway was transferred to Dutchess County as part of a highway maintenance swap between the county and the state of New York. The highway became part of an extended County Route 78 (CR 78), which had begun at the junction of NY 9G and NY 402 prior to the swap. (Full article...)
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References and notes

  1. ^ "I-49 Missouri-Arkansas Connector Project completed after more than 40 years". Retrieved January 4, 2022.
  2. ^ Strawser, Justin (April 6, 2020). "Graffiti Highway to be closed by owners". The Daily Item. Retrieved April 6, 2020.
  3. ^ Reed, J. (April 6, 2020). "Work Begins on Centralia's Graffiti Highway; State Police Enforce". Skook News. Retrieved April 6, 2020.
  4. ^ Munsun, Jeff (October 3, 2019). "Exit numbers to change on Carson City Freeway beginning this weekend". Carson Now. Retrieved October 3, 2019.
  5. ^ Marusak, Joe (May 31, 2019). "First part of I-77 toll lanes finally opened Saturday. Here's what you need to know". The Charlotte Observer. Retrieved June 1, 2019.
  6. ^ Lindblom, Mike (February 4, 2019). "New tunnel? No problem? It was an easy, light-traffic day Monday on Highway 99". The Seattle Times. Retrieved February 6, 2019.
  7. ^ Smith, Jerry (January 10, 2019). "U.S. 301 Mainline toll road opens Thursday to cheers and jeers". The News Journal. Wilmington, DE. Retrieved January 10, 2019.
  8. ^ "Route 219 extension opens". The Tribune-Democrat. Johnstown, PA. November 21, 2018. Retrieved November 22, 2018.
  9. ^ Campbell, LouAnna (November 7, 2018). "Lindale relief route open, Toll 49 extended from I-20 to US Highway 69, north of Lindale". Tyler Morning Telegraph. Retrieved January 31, 2019.
  10. ^ "Hogan Administration Announces Long-Awaited US 219 Realignment Construction Project in Garrett County" (Press release). Maryland State Highway Administration. October 13, 2018. Retrieved October 13, 2018.
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