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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.
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).
SBI Route numbers that were superseded by other routes, US or state routes were often reused. For example, SBI Route 61 was originally assigned to a road segment in northeastern Illinois, but was reassigned to a route in western Illinois, sometime after 1937. Illinois Route 72 cross-sign mounted on a stoplight in Hoffman Estates
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
These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, even-numbered Interstates run east–west, with lower numbers in the south and higher numbers in the north; odd-numbered Interstates run north–south, with lower numbers in ...
The Cannon Ball Route was a historic auto trail that ran from Hannibal, Missouri east-northeast to Chicago, Illinois. [5] The route was included in the 1917 Map of Marked Routes provided by the Illinois State Highway Department, a precursor to the modern-day Illinois Department of Transportation.
U.S. Route 20 (US 20) in the state of Illinois runs northwest to southeast in the northern end of the state. It crosses the Mississippi River into East Dubuque and exits Chicago south of the Chicago Skyway; the highway is 233.93 miles (376.47 km) long. [1]
In 1970 the beginning was moved west to Harlem Avenue (Illinois Route 43), where it intersected with US 66. [12] [13] US 41: The route enters through the southeastern part of the city from Indiana with U.S. Route 12 and U.S. Route 20, underneath the Chicago Skyway Toll Bridge.