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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.

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).

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.

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.

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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  • US Highway 131 (US 131) is a north–south United States Numbered Highway, of which all but 0.64 of its 269.96 miles (1.03 of 434.46 km) are within the state of Michigan. The highway starts in rural Indiana south of the state line as a state road connection to the Indiana Toll Road. As the road crosses into Michigan it becomes a state trunkline highway that connects to the metropolitan areas of Kalamazoo and Grand Rapids before continuing north to its terminus at Petoskey. US 131 runs as a freeway from south of Portage through to Manton in the north. Part of this freeway runs concurrently with Interstate 296 (I-296) as an unsigned designation through Grand Rapids. US 131 forms an important corridor along the western side of the Lower Peninsula of Michigan, running through rural farm and forest lands as well as urban cityscapes. Various names have been applied to the roadway over the years. The oldest, the Mackinaw Trail, originated from an Indian trail in the area while other names honored politicians. An attempt to dedicate the highway to poet James Whitcomb Riley failed to gain official support in Michigan.

    The first state highways along the US 131 corridor were designated as early as 1919. When the US Highway System was formed on November 11, 1926, US 131 was created along the route of M-13 in Michigan. Originally ending at Fife Lake on the north end, the highway was extended to Petoskey in the late 1930s. Further changes were made, starting in the 1950s, to convert segments of the road to a full freeway. The state started this conversion simultaneously at two locations: heading north from Three Rivers, and heading both north and south from a point in southern Kent County. A third segment was built south of Cadillac and over subsequent years Michigan filled the gaps in the freeway. Cadillac and Manton were bypassed in the early part of the 21st century, resulting in the current freeway configuration. Another large-scale construction project in 2000 rebuilt an unusual section of the freeway through Grand Rapids known as the S-Curve. Two bridges formerly used by US 131 have been labeled by the Michigan Department of Transportation (MDOT) as historic structures; one of them has been listed on the National Register of Historic Places (NRHP). (Full article...)
  • The Chickasaw Turnpike, also designated State Highway 301 (SH-301), is a controlled-access road in the rural south central region of the U.S. state of Oklahoma. A two-lane freeway, it stretches for 13.3 miles (21.4 km) from north of Sulphur to just south of Ada. The Oklahoma Turnpike Authority (OTA) owns, maintains, and collects tolls on the turnpike. The first section of the Chickasaw Turnpike opened on September 1, 1991.

    The Chickasaw resulted from a compromise between urban and rural legislators. Originally, it was part of a now-canceled plan to connect southern and eastern Oklahoma with a longer turnpike. It was also intended to link Ada to the Interstate system. A four-mile (6.4 km) segment of the turnpike was transferred to the Oklahoma Department of Transportation (ODOT), making it a toll-free road, in 2011. (Full article...)
  • New York State Route 22 (NY 22) is a north–south state highway that parallels the eastern border of the U.S. state of New York, from the outskirts of New York City to the hamlet of Mooers in Clinton County near the Canadian border. At 337 miles (542 km), it is the state's longest north–south route and the third longest state route overall, after NY 5 and NY 17. Many of the state's major east–west roads intersect with, and often join, NY 22 just before crossing into the neighboring New England states, where U.S. Route 7 (US 7), which originally partially followed NY 22's alignment, similarly parallels the New York state line.

    Almost all of NY 22 is a two-lane rural road through small villages and hamlets. The exceptions are its southern end in the heavily populated Bronx and lower Westchester County, and a section that runs through the city of Plattsburgh near the northern end. The rural landscape that the road passes through varies from horse country and views of the reservoirs of the New York City watershed in the northern suburbs of the city, to dairy farms further upstate in the Taconic and Berkshire mountains, to the undeveloped, heavily forested Adirondack Park along the shores of Lake Champlain. An 86-mile (138 km) section from Fort Ann to Keeseville is part of the All-American Road known as the Lakes to Locks Passage. (Full article...)
  • Interstate 80 (I-80) is a transcontinental Interstate Highway in the United States, stretching from San Francisco, California, to Teaneck, New Jersey. In Iowa, the highway travels west to east through the center of the state. It enters the state at the Missouri River in Council Bluffs and heads east through the southern Iowa drift plain. In the Des Moines metropolitan area, I-80 meets up with I-35 and the two routes bypass Des Moines together. On the northern side of Des Moines, the Interstates split and I-80 continues east. In eastern Iowa, it provides access to the University of Iowa in Iowa City. Northwest of the Quad Cities in Walcott is Iowa 80, the world's largest truck stop. I-80 passes along the northern edge of Davenport and Bettendorf and leaves Iowa via the Fred Schwengel Memorial Bridge over the Mississippi River into Illinois.

    Before I-80 was planned, the route between Council Bluffs and Davenport, which passed through Des Moines, was vital to the state. Two competing auto trails, the Great White Way and the River-to-River Road, sought to be the best path to connect three of the state's major population centers. The two trails combined in the 1920s and eventually became US Highway 32 (US 32) in 1926. US 6, which had taken the place of US 32, became the busiest highway in the state. In the early 1950s, plans were drawn up for the construction of an Iowa Turnpike, to be the first modern four-lane highway in the state, along the US 6 corridor. Plans for the turnpike were shelved when the Interstate Highway System was created in 1956. (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...)
  • New York State Route 28N (NY 28N) is an east–west state highway in the North Country of New York in the United States. It extends for 50.95 miles (82.00 km) through the Adirondack Mountains from Blue Mountain Lake to North Creek. The route is a northerly alternate route to NY 28 between both locations; as such, it passes through several communities that NY 28 bypasses to the south. The westernmost 10 miles (16 km) of NY 28N overlap with NY 30 through the town of Long Lake. NY 28N and NY 30 split in the hamlet of Long Lake, from where NY 30 heads to the north and NY 28N proceeds eastward through mountainous regions of Adirondack Park.

    The 40-mile (64 km) section of NY 28N not concurrent with NY 30 is designated as the Roosevelt–Marcy Trail, a scenic byway named for Theodore Roosevelt, who was then the Vice President of the United States. The byway marks the path Roosevelt took in 1901 to reach North Creek from Mount Marcy after learning that President William McKinley had been assassinated. The route has a rather scant history before its designations. The road originated as an old highway stretching from Warren County to Long Lake. It was used for transportation in the iron ore industry in Newcomb, and for the lumber industry in Minerva. New York State gained control of the road in 1909. The NY 28N designation was assigned as part of the 1930 renumbering of state highways in New York, incorporating part of pre-1930 NY 10. (Full article...)
  • M-35 is a state trunkline highway in the Upper Peninsula (UP) of the US state of Michigan. It runs for 128 miles (206 km) in a general north–south direction and connects the cities of Menominee, Escanaba, and Negaunee. The southern section of M-35 in Menominee and Delta counties carries two additional designations; M-35 forms a segment of the Lake Michigan Circle Tour, and it is the UP Hidden Coast Recreational Heritage Trail, which is a part of what is now called the Pure Michigan Byways Program. Along the southern section, the highway is the closest trunkline to the Green Bay, a section of Lake Michigan. The northern section of the highway turns inland through sylvan areas of the UP, connecting rural portions of Delta and Marquette counties.

    M-35 is an original state trunkline that was first signposted in 1919, that was intended to run from Menominee in the south to near Big Bay in the north, before it was to turn toward L'Anse to end at Ontonagon. However, the section through the Huron Mountains in northern Marquette and Baraga counties was never built. Automobile pioneer Henry Ford helped halt this construction to gain favor with and membership into the exclusive Huron Mountain Club. Some discontinuous sections were later ceded to local control. The northern segment of the route between Ontonagon and Baraga was retained as a discontinuous segment of the highway; this northern segment was later redesignated as M-38, another state trunkline. The northern end was later rerouted out of the City of Negaunee into Negaunee Township to avoid mining activity near Palmer. (Full article...)


  • The Ridge Route, officially the Castaic–Tejon Route and colloquially known as the Grapevine, was a two-lane highway between Los Angeles County and Kern County, California, United States. Opened in 1915 and paved with concrete between 1917 and 1921, the road was the first paved highway directly linking the Los Angeles Basin with the San Joaquin Valley (southern Central Valley) over the Tejon Pass and the rugged Sierra Pelona Mountains ridge south of Gorman. Much of the old road runs through the Angeles National Forest, and passes many historical landmarks, including the National Forest Inn, Reservoir Summit, Kelly's Half Way Inn, Tumble Inn, and Sandberg's Summit Hotel. North of the forest, the Ridge Route passed through Deadman's Curve before ending at Grapevine.

    The road was originally built as a state highway, a segment of the unsigned Legislative Route 4, before it became signed as part of U.S. Route 99 (US 99) in 1926. The road was then bypassed by the three-lane Ridge Route Alternate to handle increased traffic and remove curves; the Alternate in Los Angeles County was completed in 1933, and Kern County line to Grapevine in 1936. The roadway was widened to a four-lane expressway in 1953 and replaced by an eight-lane freeway, Interstate 5 (I-5) in 1960-70. The portion of the road in the Angeles National Forest was added to the National Register of Historic Places in 1997, by the efforts of retired engineer Harrison Scott. Much of the road has been closed by the U.S. Forest Service; other remnants are used by local traffic. (Full article...)
  • Interstate 182 (I-182) is an east–west auxiliary Interstate Highway in the U.S. state of Washington. It connects I-82 to the Tri-Cities region and crosses the Columbia River on the Interstate 182 Bridge between Richland and Pasco. I-182 is 15 miles (24 km) long and entirely concurrent with U.S. Route 12 (US 12). It also intersects Washington State Route 240 (SR 240) and US 395.

    Business leaders in the Tri-Cities began lobbying for a freeway in 1958 after early alignments for I-82 were routed away from the area. I-182 was created by the federal government in 1969 as a compromise that would directly connect to the Tri-Cities area while allowing other traffic to bypass it. The project would also incorporate an existing proposal to build a bridge between Richland and Pasco at the site of a cable ferry that ran until 1931. (Full article...)

  • 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...)
  • State Route 522 (SR 522) is a state highway in the U.S. state of Washington that serves the Seattle metropolitan area. Approximately 25 miles (40 km) long, it connects the city of Seattle to the northeastern suburbs of Kenmore, Bothell, Woodinville, and Monroe. Its western half is primarily an arterial street, named Lake City Way and Bothell Way, that follows the northern shore of Lake Washington; the eastern half is a grade-separated freeway that runs between Woodinville and Monroe. SR 522 connects several of the metropolitan area's major highways, including Interstate 5 (I-5), I-405, SR 9, and U.S. Route 2 (US 2).

    The present-day route of SR 522 was built in stages between 1907 and 1965, beginning with the Red Brick Road from Seattle to Bothell, then part of the Pacific Highway and later US 99. The road later became a branch of Primary State Highway 2 (PSH 2) in 1937, and was extended east to Redmond and North Bend. A branch of the Stevens Pass Highway was built to connect PSH 2 in Bothell and Monroe in 1965, and was incorporated into SR 202 after it was designated in 1964. The Bothell–Monroe highway was re-designated as part of SR 522 in 1970, leaving SR 202 on the Bothell–North Bend highway. (Full article...)
  • Interstate 94 (I-94) is a part of the Interstate Highway System that runs from Billings, Montana, to the Lower Peninsula of the US state of Michigan. In Michigan, it is a state trunkline highway that enters the state south of New Buffalo and runs eastward through several metropolitan areas in the southern section of the state. The highway serves Benton Harbor–St. Joseph near Lake Michigan before turning inland toward Kalamazoo and Battle Creek on the west side of the peninsula. Heading farther east, I-94 passes through rural areas in the middle of the southern Lower Peninsula, crossing I-69 in the process. I-94 then runs through Jackson, Ann Arbor, and portions of Metro Detroit, connecting Michigan's largest city to its main airport. Past the east side of Detroit, the Interstate angles northeasterly through farmlands in The Thumb to Port Huron, where the designation terminates on the Blue Water Bridge at the Canada–United States border.

    The first segment of what later became I-94 within the state, the Willow Run Expressway, was built near Ypsilanti and Belleville in 1941, with an easterly extension to Detroit in 1945. This expressway was initially numbered M-112. In the mid-1950s, state and federal officials planned an Interstate to replace the original route of US Highway 12 (US 12). By 1960, the length of I-94 was completed from Detroit to New Buffalo. Two years later, the US 12 designation was dropped from the freeway. Subsequent extensions in the 1960s completed most of the rest of the route, including the remaining sections between Detroit and Port Huron which superseded the routing of US 25. The last segment opened to the public in 1972 when Indiana completed its connection across the state line. Since completion, I-94 has remained relatively unchanged; a few interchanges have been rebuilt, a second span was constructed for the Blue Water Bridge, and, in 1987, a plane crashed on the freeway during takeoff from the airport in Detroit. The routing of I-94 is notable for containing the first full freeway-to-freeway interchange in the United States, connecting to the Lodge Freeway (M-10), and for comprising the first complete border-to-border toll-free freeway in a state in the United States. The highway has one auxiliary route, I-194, which serves downtown Battle Creek, and eight business routes. Various segments have been dedicated to multiple people and places. (Full article...)
  • Interstate 15 (I-15) is an Interstate Highway, running from San Diego, California, United States, to the Canadian border, through Mohave County in northwestern Arizona. Despite being isolated from the rest of Arizona, in the remote Arizona Strip, and short in length at 29.43 miles (47.36 km), it remains notable for its scenic passage through the Virgin River Gorge. The highway heads in a northeasterly direction from the Nevada border northeast of Mesquite, Nevada, to the state line, southwest of St. George, Utah.

    The southern portion of I-15's route was built close to the alignment of the old U.S. Route 91 (US 91), but the northern section, through the Virgin River Gorge, was built along roadless terrain. The southern section of the highway was complete and open in the early 1960s, but the gorge section was inaccessible until 1973. When it opened, the Virgin River Gorge passage was the most expensive section of rural Interstate per mile. (Full article...)
  • Interstate 696 (I-696) is an east–west auxiliary Interstate Highway in the Metro Detroit region of the US state of Michigan. The state trunkline highway is also known as the Walter P. Reuther Freeway, named for the prominent auto industry union head by the Michigan Legislature in 1971. I-696 is a bypass route, detouring around the city of Detroit through the city's northern suburbs in Oakland and Macomb counties. It starts by branching off I-96 and I-275 at its western terminus in Farmington Hills, and runs through suburbs including Southfield, Royal Oak and Warren before merging into I-94 at St. Clair Shores on the east end. It has eight lanes for most of its length and is approximately 10 miles (16 km) north of downtown Detroit. I-696 connects to other freeways such as I-75 (Chrysler Freeway) and M-10 (Lodge Freeway). Local residents sometimes refer to I-696 as "The Autobahn of Detroit".

    Planning for the freeway started in the 1950s. Michigan state officials proposed the designation I-98, but this was not approved. Construction started on the first segment in 1961, and the Lodge Freeway was designated Business Spur Interstate 696 (BS I-696) the following year. The western third of the freeway opened in 1963, and the eastern third was completed in January 1979. The central segment was the subject of much controversy during the 1960s and 1970s. Various municipalities along this stretch argued over the routing of the freeway such that the governor locked several officials into a room overnight until they would agree to a routing. Later, various groups used federal environmental regulations to force changes to the freeway. The Orthodox Jewish community in Oak Park was concerned about pedestrian access across the freeway; I-696 was built with a set of parks on overpasses to accommodate their needs. The Detroit Zoo and the City of Detroit also fought components of the freeway design. These concessions delayed the completion of I-696 until December 15, 1989. Since completion, the speed limit was raised from 55 to 70 miles per hour (89 to 113 km/h). In addition, some interchanges were reconfigured in 2006. (Full article...)
  • Interstate 675 (I-675) is an auxiliary Interstate Highway in the US state of Michigan. The freeway is a 7.7-mile-long (12.4 km) loop route through downtown Saginaw, as I-75 passes on the east side of the city. I-675 is also a state trunkline highway that provided a bypass of the former drawbridge carrying I-75 and US Highway 23 (US 23) across the Saginaw River. Construction of I-675 started in 1969 and the freeway opened in 1971. Since then, sections near downtown were reconstructed between 2009 and 2011 to update one of the freeway's interchanges and rebuild the bridge over the Saginaw River. (Full article...)

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Roads in the United States
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