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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 ...
There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, odd-numbered Interstates run south–north, with lower ...
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.
In 1925, the Joint Board on Interstate Highways, recommended by the American Association of State Highway Officials (AASHO), worked to form a national numbering system to rationalize the roads. After several meetings, a final report was approved by the U.S. Department of Agriculture in November 1925.
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Interstate Highways in New York (state) (7 C, 44 P) Interstate Highways in North Carolina (9 C, 40 P) Interstate Highways in North Dakota (2 C, 13 P) O.
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
The following list contains the most notable road interchanges within the United States divided by each state, which are mainly part of the national Interstate Highway System and are all freeways intersecting with each other at a junction.