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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).
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 ...
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]
Interstate 474 (I-474) is an Interstate Highway loop route that provides a southwestern bypass around the north-central Illinois city of Peoria. I-474's parent Interstate is I-74. As the first digit of the Interstate's number is even, it follows the established convention of providing a loop around a city. I-474 is 14.88 miles (23.95 km) long.
Formerly IL 70A and IL 186; originally Red Bud to Sparta IL 171 — — — — 1924: 1936 Thomson to IL 78 IL 171: 38.61: 62.14 US 6 in Joliet: IL 72 in Chicago: 1946: current Formerly IL 4A and IL 213; originally Thomson to IL 78 IL 172 — — — — 1924: 1936