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United States Numbered Highways are the components of a national system of highways administered by the American Association of State Highway and Transportation Officials (AASHTO), a nonprofit, nonpartisan association, [3] and the various state departments of transportation.
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 Associated routes: I-287, I-587, I-787: I-88: 140.60: 226.27
A map of the United States' Interstate Highways as of 1 October 1970. Numbered highways in the United States; List of Interstate Highways; List of United States Numbered Highways; Further information: Interstate Highway System; United States Numbered Highway System; Historic trails and roads in the United States
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.
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]
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List of regions of the United States; Lists of U.S. state topics; List of U.S. states and territories by population; Local government in the United States; Organized incorporated territories of the United States; Proposals for a 51st state; Territorial evolution of the United States; U.S. territorial sovereignty; Compact of Free Association