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Illinois State Highway System
Highway system in Illinois, United States / From Wikipedia, the free encyclopedia
The organized State Highway System of the U.S. state of Illinois comprises all of the state routes in the state.
Quick Facts State Highway System, System information ...
State Highway System | |
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![]() Highway markers for Interstate 57, U.S. Route 45, Illinois Route 1 and the Chicago Skyway | |
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System information | |
Maintained by IDOT, ISTHA, and SCC | |
Formed | November 5, 1918 (1918-11-05)[1] |
Highway names | |
Interstates | Interstate X (I-X) |
US Highways | U.S. Route X (US X) |
State | Illinois Route X (IL X) |
System links | |
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