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highest number currently used in system; shortest highway in the system US 789 — — — — — — Proposed, but never commissioned US 830: 209: 336 US 101 northeast of Ilwaco, WA: US 97 north of Maryhill, WA: 1926: 1968 Intrastate, Washington only; now SR 14, I-5 (former US 99), SR 432, and SR 4
Interstate Highway numbers increase from west-to-east and south-to-north, to keep identically numbered routes geographically apart in order to keep them from being confused with one another, [8] and it omits 50 and 60 which would potentially conflict with US 50 and US 60. [e] In the US Highway system, three-digit numbers are assigned to spurs ...
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.
Auxiliary highways have an added digit prefixing the number of the parent highway. Five route numbers are duplicated in the system; the corresponding highways are in different regions, reducing potential confusion. In addition to primary highways in the contiguous United States, there are signed Interstates in Hawaii and unsigned Interstates in ...
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]
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 ...
This image is a work of a United States Department of Transportation employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain
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.
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