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Follows the East Coast of the United States, longest north-south US Highway US 2: 2,112: 3,399 I-5/SR 529 in Everett, WA: I-75 in St. Ignace, MI: 1926: current Western segment US 2: 460: 740 US 11 in Rouses Point, NY: I-95 in Houlton, ME: 1926: current Eastern segment US 3: 273: 439 Route 2A/Route 3 in Cambridge
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 the 1950s, the numbering grid for the new Interstate Highway System was established as intentionally opposite from the US grid insofar as the direction the route numbers increase. 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 ...
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 1926, the United States Numbered Highway System was established, creating the first national road numbering system for cross-country travel. The roads were funded and maintained by U.S. states, and there were few national standards for road design. United States Numbered Highways ranged from two-lane country roads to multi-lane freeways.
Special routes of the United States Numbered Highway System (1,887 P) Bridges of the United States Numbered Highway System (1 C, 423 P) Divided U.S. Highways (1 C, 71 P)
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
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