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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 ...
Shortest state highways by state State Highway mi km References Alabama: State Route 151: 0.404 0.650 [1] Alaska: Route 98: 13.4 21.6 [2] Arizona: State Route 90 Spur: 0.420 0.676 [3] Arkansas: Highway 369: 0.196 0.315 [4] California: State Route 77: 0.353 0.568 [5] Colorado: State Highway 110: 0.186 0.299 [6] Connecticut: Connecticut Route 78: ...
Auxiliary Interstate Highways (also called three-digit Interstate Highways) are a subset of highways within the United States' Interstate Highway System.The 323 auxiliary routes generally fall into three types: spur routes, which connect to or intersect the parent route at one end; bypasses, which connect to the parent route at both ends; and beltways, which form a circle that intersects the ...
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]
[10] [12] AASHTO guidelines specifically prohibit Interstate Highways and U.S. Routes from sharing a number within the same state. [4] As with other guidelines, exceptions exist across the U.S. [12] Some two-digit numbers have never been applied to any U.S. Route, including 37, 39, 47, 86, and 88.
Interstate 37 near San Antonio, TX: 1926: current Intrastate, Texas only; AASHTO says the northern terminus is at the northern end of I-37 US 183: 1,035: 1,666 US 77 in Refugio, TX: I-90 west of Presho, SD: 1930: current US 185: 124: 200 Casper, WY: Cheyenne, WY: 1926: 1934 Intrastate, Wyoming only; replaced by US 87: US 187: 207