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The Illinois Department of Transportation (IDOT), Illinois State Toll Highway Authority (ISTHA), and Skyway Concession Company (SCC) are responsible for maintaining these highways in Illinois. 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]
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.
Number Length (mi) [2] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes US 6: 179.88: 289.49 I-74/US 6 in Moline: I-80/I-94/US 6 in Lansing: 1932: current 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
Illinois Route 111 (IL 111) is an 82.18-mile-long (132.26 km) north–south state highway in the southwestern part of the U.S. state of Illinois. It travels from Short Street (near Lake Drive and 1 ⁄ 4 mile (0.40 km) northwest of Interstate 255 ) in Centreville to IL 104 in Waverly .
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]
U.S. Route 54 (US 54) in Illinois is a 23.9-mile-long (38.5 km) east–west highway that travels from the Champ Clark Bridge on the Missouri state line to I-72/US 36/IL 107 south of Griggsville. At its greatest extent, US 54 used to continue east to Springfield , then northeast to Onarga , and then north all the way to Downtown Chicago .
In 1971, US 30 Alt. in Illinois was discontinued, renamed as IL 38 west of Westchester, and dropped through the city of Chicago. [2] Since a 2008 realignment, US 30 passes a mile (1.6 km) to the north of downtown Plainfield on 143rd Street, then turns south onto IL 59 (Division Street) for approximately one mile (1.6 km). Southeast of downtown ...
The Illinois Department of Transportation was created by the 77th Illinois General Assembly in January 1972. The department absorbed the functions of the former Department of Public Works and Buildings, acquired some planning and safety inspection functions of other state agencies, and received responsibility for state assistance to local mass transportation agencies such as the Chicago-area ...