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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 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.
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.
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 .
Illinois Route 120 (IL 120) is a major east–west state highway in northeastern Illinois.It runs from U.S. Route 14 near Woodstock to Illinois Route 131 in Waukegan.It travels a distance of 34.62 miles (55.72 km) [1] and is one of the few roads that provides direct access from McHenry County to Interstate 94 (Tri-State Tollway) in Lake County.
Illinois Route 163 (IL 163) is a 9.89-mile-long (15.92 km) north–south highway in southwestern Illinois. [1] It runs from IL 158 in Millstadt north to IL 15 in Alorton; the route is located entirely within St. Clair County. IL 163 is maintained by the Illinois Department of Transportation.
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.