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A map of the Strategic Highway Network, one component of the NHS Map of average freight truck traffic on the NHS in 2015. According to the Federal Highway Administration, the 160,000-mile (260,000 km) National Highway System includes roads important to the United States' economy, defense, and mobility, from one or more of the following road networks (specific routes may be part of more than ...
The Pan-American Highway is a vast network of roads that stretches approximately 30,000 kilometers (about 19,000 miles) from Prudhoe Bay, Alaska, in the northernmost part of North America to Ushuaia, Argentina, at the southern tip of South America. It is recognized as the longest road in the world and serves as a significant overland route ...
Major north–south routes generally have numbers ending in "1", while major east–west routes usually have numbers ending in "0". [1] [c] Three-digit numbered highways are generally spur routes of parent highways; for example, U.S. Route 264 (US 264) is a spur off US 64.
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 ...
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
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 Pershing Map FDR's hand-drawn map from 1938. The United States government's efforts to construct a national network of highways began on an ad hoc basis with the passage of the Federal Aid Road Act of 1916, which provided $75 million over a five-year period for matching funds to the states for the construction and improvement of highways. [8]
Many settlements in Alaska are disconnected from the continental road network except by ferry or boat, including the capital Juneau, Sitka, Kodiak, Bethel, Nome, and Utqiaġvik. [4] The Dalton Highway connects the mainland via Fairbanks with the otherwise remote Prudhoe Bay, Alaska on the North Slope as a service road for the Trans-Alaska Pipeline.
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