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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]
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.
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 ...
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]
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 entire highway in Illinois is named the Walter Payton Memorial Highway after Pro Football Hall of Famer Walter Payton, who wore #34 for the Chicago Bears. The highway is 211.37 miles (340.17 km) long within the state. [2] The bridge into Iowa over the Mississippi River is called the Great River Bridge.
In late 2005, the intersection with Mannheim Road was reconstructed to remove unsafe conditions and bring the route closer to Interstate standards. In the late 1990s, the Illinois Department of Transportation (IDOT) restriped I-190 at I-294. This action increased the number of lanes west of I-294 from two to three.