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| List of United States Numbered Highways ： ウィキペディア英語版 |
List of United States Numbered Highways
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The following is a list of United States numbered highways. It includes U.S. Numbered Highways both past and present, with the former shaded in gray. Three-digit subsidiaries are grouped with their one- or two-digit parent. The list is based on American Association of State Highway and Transportation Officials (AASHTO) definitions, with up-to-date details on extensions and truncations, though distances are as of 1989. Discrepancies with state specifications are noted.
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 less than 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.
==List==
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