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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).
The route was incorporated in the Chicago Plan Commission's [2] plans for post-war highway construction. The Federal-Aid Highway Act of 1956 spurred extensive construction around Chicago, but by 1960, the Crosstown Expressway was the only route included in the region's postwar transportation plans yet to break ground. [3] The State of Illinois ...
Descriptions of each individual state highway are filed with the county clerk of the county in which the state highway resides. [4] State highways may be maintained by either the municipalities if within a municipality, or the Illinois Department of Transportation. [ 5 ]
Illinois Route 255 (IL 255), also referred to as the Alton Bypass, is a northwesterly extension of Interstate 255 (I-255) in southwestern Illinois in the St. Louis metropolitan area. IL 255 starts at I-270 in Pontoon Beach and ends at U.S. Route 67 (US 67) in Godfrey , at a total length of approximately 23.3 miles (37.5 km).
Another US 67 Alternate was created in 1952 as a result of the construction of a 32-mile-long (51 km), straighter, and modern highway being built between Medora and Murrayville. State highway officials appealed to AASHO to reroute US 67 along IL 111 between the Y intersection at Godfrey to Medora and thence on the new highway to Murrayville.
Interstate 490 (I-490), also known as the O'Hare West Bypass and Western O'Hare Beltway, is a six-mile (9.7 km) electronic toll highway and a beltway that is currently under construction near Chicago, Illinois; it will run along the west side of O'Hare International Airport. [1]
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.
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 ...