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Inventory Route Number sign near Jacksonville IL (Morgan County) on US-67. Illinois uses unique "inventory number" signage on rural roads that are owned or maintained by IDOT but may or may not be part of the US or Illinois highway systems. These number signs are white squares, with a green divided circle.
SBI # 1 paid for Route 1, and so on. These initial 46 route numbers marked the major infrastructure roads desired by the state legislature in 1918. Remarkably, many of these numbers still exist on the original or nearby alignment. As the highway system grew these numbers were altered to accommodate new roads or extensions of older roads.
Grand Army of the Republic Highway US 12: 85.14: 137.02 US 12 near Richmond: US 12/US 20/US 41 in Chicago: 1928: current US 14: 69.55: 111.93 US 14 near Harvard: US 41 in Chicago: 1933: current Ronald Reagan Highway / Northwest Highway US 20: 233.93: 376.47 US 20 in East Dubuque: US 12/US 20/US 41 in Chicago: 1926: current
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 these counties, county lines often run down the middle of county roads; each side of the road may have a different number. Most counties in neighboring Indiana use a similar system. Many former alignments of U.S. and state routes, particularly U.S. Routes 25 and 40, are now maintained as county routes that retain their former route numbers ...
The Interstate Highway System in Illinois consists of 13 primary highways and 11 auxiliary highways which cover 2,248.93 miles (3,619.30 km). [2] The Interstate Highway with the longest section in Illinois is Interstate 57 at 358.57 miles (577.06 km); the shortest is Interstate 41 at 0.90 miles (1.45 km).
In 1935 the Ohio General Assembly passed a law which added 5,000 miles of roads to the state highway system over a 12-month period. [7] [8] These roads were assigned route numbers in the 500s, 600s, and 700s. [9] In 1962 certain numbers were retired to accommodate numbers in the Interstate Highway System. [citation needed]
U.S. Route 45 (US 45) in the state of Illinois is a major north–south U.S. Highway that runs from the Brookport Bridge over the Ohio River at Brookport north through rural sections of eastern Illinois and then through the suburbs of Chicago to the Wisconsin state line east of Antioch.