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[a] This is a list of the longest state highways in each state. As of 2007 [update] , the longest state highway in the nation is Montana Highway 200 , which is 706.624 miles (1,137.201 km) long. The shortest of the longest state highways is District of Columbia Route 295 , which is 4.29 miles (6.90 km) long.
Since the policy on numbering and designating US Highways was updated in 1991, AASHTO has been in the process of eliminating all intrastate U.S. Highways under 300 miles (480 km) in length, "as rapidly as the State Highway Department and the Standing Committee on Highways of the American Association of State Highway and Transportation Officials ...
US 64/US 264 in Wendell, North Carolina: 2017: current Unfinished in North Carolina; North Carolina only; planned in one more: Virginia Associated route: I-587 Shortest Interstate highway in contiguous United States I-87: 333.49: 536.70 I-278 in New York City: A-15 at Canadian border in Champlain, New York: 1957: current New York only
The "0" in its route number indicates that US 20 is a major coast-to-coast route. Spanning 3,365 miles (5,415 km), it is the longest road in the United States, [1] and, in the east, the route is roughly parallel to Interstate 90 (I-90), which is the longest Interstate Highway in the U.S.
I-90 is the longest Interstate Highway in the United States, spanning 3,021 miles (4,862 km) across the northern portion of the coterminous part of the country. [2] The transcontinental freeway passes through 13 states in the Pacific Northwest, Mountain West, Great Plains, Midwest, and the Northeast regions of the United States.
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.
The system includes 4% of the nation's roads, but carries more than 40% of all highway traffic, 75% of heavy truck traffic, and 90% of tourist traffic. [2] All urban areas with a population of over 50,000 and about 90% of America's population live within 5 miles (8.0 km) of the network, [2] which is the longest in the world. [9]
In 1918, Wisconsin became the first state to number its highways in the field followed by Michigan the following year. [1] In 1926 the American Association of State Highway Officials (AASHO) established and numbered interstate routes (United States Numbered Highways), selecting the best roads in each state that could be connected to provide a national network of federal highways.