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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).
These highways are maintained by the Illinois Department of Transportation (IDOT), with the exception of Illinois Route 390 and parts of Illinois Route 56 and Illinois Route 110, which are maintained by the Illinois State Toll Highway Authority (ISTHA), and all routes that enter the Chicago City Limits are maintained by the Chicago Department ...
State highways may be maintained by either the municipalities if within a municipality, or the Illinois Department of Transportation. [5] Should a highway run through a municipality, IDOT is authorized to choose a route through the municipality in order to make a route contiguous for through traffic.
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 ...
The highway passes just to the west of the St. Louis Regional Airport and Southern Illinois University Edwardsville. Although IL 255 was designed to federal Interstate Highway standards, it was built by the Illinois Department of Transportation (IDOT) using state-provided funds. [citation needed]
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 Ulysses S. Grant Memorial Highway US 24: 255.13: 410.59 US 24 in Quincy: US 24/US 52 in Sheldon: 1926: current US 30: 153.79: 247.50 US 30 in Fulton: US 30 in Lynwood: 1926: current US 32 — — US 6 at Moline
Illinois Route 336 (IL 336, also known as the Thomas A. Oakley Memorial Highway) is a four-lane freeway/expressway combination that serves western Illinois.It is also used by the Illinois Department of Transportation (IDOT) as a part of Federal-Aid Primary Highway 315 (FAP315) to refer to a future project connecting the cities of Quincy and Peoria via underserved Macomb.
The DuPage County Highway System is a county-maintained system of arterial county highways in DuPage County, Illinois, United States.They are marked with the standard M1-6 [1] pentagon-shaped highway marker on the base of traffic signals at intersections with other county highways.