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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).
Inventory Route Number sign near Jacksonville IL (Morgan County) on US-67. Illinois uses unique "inventory number" signage on rural roads that are owned or maintained by IDOT but may or may not be part of the US or Illinois highway systems. These number signs are white squares, with a green divided circle.
US 12 near Richmond: US 12/US 20/US 41 in Chicago: 1928: current US 14: 69.55: 111.93 US 14 near Harvard: US 41 in Chicago: 1933: current 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
In 1971, US 30 Alt. in Illinois was discontinued, renamed as IL 38 west of Westchester, and dropped through the city of Chicago. [2] Since a 2008 realignment, US 30 passes a mile (1.6 km) to the north of downtown Plainfield on 143rd Street, then turns south onto IL 59 (Division Street) for approximately one mile (1.6 km). Southeast of downtown ...
Illinois 23 is a major arterial route in rural central and north-central Illinois. It is a parallel to the Interstate 39 / U.S. Route 51 combination approximately 20 miles (32 km) west. The road starts near downtown Pontiac and runs as the main highway north, intersecting with Interstate 55 and former U.S. Route 66 .
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 97 (IL 97) is a north–south state highway in the central and western portions of the U.S. state of Illinois. It extends from I-55 Business (Business Loop I-55) in Springfield northwest to U.S. Highway 150 (US 150) near Galesburg. It crosses over the Illinois River on a bridge west of Havana. This is a distance of 102.23 miles ...
Illinois Route 40 (IL 40) is a 112.05-mile-long (180.33 km) north–south route in central portion of the U.S. state of Illinois. It runs from Interstate 74 (I-74) in East Peoria north to IL 78 at Mt. Carroll , just south of U.S. Route 52 (US 52) and IL 64 .