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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).
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 ...
This is a list of U.S. Highways in Illinois, all of which are owned and maintained by the U.S. state of Illinois. The Illinois Department of Transportation (IDOT) is responsible for maintaining the U.S Highways in Illinois. The system in Illinois consists of 20 primary highways.
Entrances to the park's two major campgrounds are located off Illinois 102. IL 113 takes a mostly parallel route, but on the south side of the river. The road is two lanes for its entire length, except for a four-lane stretch with center turn lanes measuring approximately one and a half miles (2.4 km) near its eastern end in Bourbonnais.
The US 20/IL 84 bridge over the Galena River in Galena As the highway enters Illinois across the Julien Dubuque Bridge, it continues southeasterly for a while, paralleling the Upper Mississippi River before turning east into the rugged country of the Driftless Area in Jo Daviess County, then turning flat and straight west of Stockton and entering Stephenson County.
Illinois Route 90 (IL 90) is an east–west state highway in northern Peoria County in central Illinois. It runs from IL 78 north of Laura to IL 40 south of Edelstein . This is a distance of 15.80 miles (25.43 km).
Illinois Route 57 (IL 57) is a north–south [3] state highway in western Illinois. It runs from Interstate 172 (I-172) in Fall Creek to U.S. Route 24 (US 24) and IL 104 in Quincy , a distance of 12.59 miles (20.26 km).
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 .