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United States Numbered Highways are components of a national system of highways that is administered by the
American Association of State Highway and Transportation Officials The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test quality control, protocols, and guidelines that are used in highway design and construction through ...
(AASHTO) and the various state departments of transportation. These
U.S. Numbered Highways The United States Numbered Highway System (often called U.S. Routes or U.S. Highways) is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these hi ...
were initially designated on November 11, 1926, and extend throughout the
contiguous United States The contiguous United States (officially the conterminous United States) consists of the 48 adjoining U.S. states and the Federal District of the United States of America. The term excludes the only two non-contiguous states, Alaska and Hawaii ...
. There are several U.S. Highways that exist entirely within one state. Since the current policy on numbering and designating US Highways was written in 1991, AASHTO has been in the process of eliminating all intrastate U.S. Highways under 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 can reach agreement with reference thereto"; new additions to the system must therefore serve more than one state. __TOC__


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See also

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List of Interstate Highways There are 70 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. They are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit ...


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Endpoints of US Highways
from Dale Sanderson (www.usends.com)
US Highway Endings
from Adam Froehlig (www.ajfroggie.com) {{DEFAULTSORT:List Of United States Numbered Highways
U.S. The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...
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