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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.
0–9. U.S. Route 6 in Illinois; U.S. Route 6 Business (Lansing, Illinois–Lake Station, Indiana) U.S. Route 12 in Illinois; Special routes of U.S. Route 14
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 ...
0–9. Illinois Route 1; Illinois Route 2; Illinois Route 3; Illinois Route 4; Illinois Route 5; Illinois Route 6; Illinois Route 7; Illinois Route 8; Illinois Route 9
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).
[2] During the middle part of the 20th century the state numbered routes expanded to new roads around the state. When the United States Numbered Highway System was introduced in the late 1920s many of the new US Routes were already part of the state system and the US number was just added to signposts. During 1930s as the US Highway System ...
Interstate 80 in Illinois; Interstate 180 (Illinois) Interstate 280 (Iowa–Illinois) Interstate 88 (Illinois) Interstate 90 in Illinois; Interstate 190 (Illinois) Interstate 290 (Illinois) Interstate 490 (Illinois) Interstate 94 in Illinois; Interstate 294; Interstate 494 (Illinois 1950s–1960s) Interstate 494 (Illinois 1960s–1970s ...
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