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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.
Illinois has used route numbers from IL 1 through IL 186 inclusive [2] as well as many others up to IL 594. [3]Illinois has used letter suffixes on several state highways, including "A", "B".
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 ]
There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, even-numbered Interstates run east–west, with lower ...
State highways may be maintained by either the municipalities if within a municipality, or the Illinois Department of Transportation. [5] Should a highway run through a municipality, IDOT is authorized to choose a route through the municipality in order to make a route contiguous for through traffic.
United States Numbered Highway System; List; Special; ... Intrastate, Illinois only; redesignated IL 31: US 431: 556: 895 US 231 in Dothan, AL: US 60 in Owensboro, KY
This is a list of toll roads in the United States ... (First Responders Memorial Highway) 11.9 19.2 US 301 – Maryland ... I-90 / Chicago Skyway – Illinois state ...
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