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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 ...
In addition, roads in the system include state highways that connect . any State park, State forest, State wildlife or fish refuge, the grounds of any State institution or any recreational, scenic or historic place owned or operated by the State; any national cemetery; and to any tax supported airport constructed in part by State and federal ...
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.
Illinois Route 2; Illinois Route 3; Illinois Route 4; Illinois Route 5; Illinois Route 6; Illinois Route 7; Illinois Route 8; Illinois Route 9; Illinois Route 10; Illinois Route 13; Illinois Route 14; Illinois Route 15; Illinois Route 16; Illinois Route 17; Illinois Route 18; Illinois Route 19; Illinois Route 21; Illinois Route 22; Illinois ...
The Illinois Department of Transportation (IDOT), Illinois State Toll Highway Authority (ISTHA), and Skyway Concession Company (SCC) are responsible for maintaining these highways in Illinois. 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]
U.S. Route 20 (US 20) in the state of Illinois runs northwest to southeast in the northern end of the state. It crosses the Mississippi River into East Dubuque and exits Chicago south of the Chicago Skyway; the highway is 233.93 miles (376.47 km) long. [1]
Illinois Route 137 (IL 137) is a 23.49-mile-long (37.80 km) state highway in northeast Illinois. It runs from the Wisconsin state line north of Winthrop Harbor south to North Chicago , west to Libertyville , and then back northwest to Grayslake , terminating at IL 83 just south of IL 120 .
U.S. Route 40 (US 40) runs east–west across south central Illinois for 159.8 miles (257.2 km). US 40 enters the state from Missouri across the Poplar Street Bridge over the Mississippi River at East St. Louis concurrent with Interstate 55 (I-55) and I-64 and exits just south of State Line, Indiana, running concurrently with I-70.