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Illinois's state route numbers originated in 1918 as State Bond Issues 1 through 46, used to finance the new roads. The numbers of the bond issues were then used to mark the highway routes along the way. Another series of bond issues were authorized in 1924 (47–185) and again were used to mark the roads they paid for.
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]
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.
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.
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]
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
Interstate Highways in Illinois (12 C, 39 P) Former state highways in Illinois (120 P) U.S. Highways in Illinois (22 C, 81 P) Pages in category "State highways in ...
I-39/US-51 join I-90, making US 51 one of the few toll highways in Illinois that is a U.S. Highway. US 51 exits I-39/I-90 just a mile south of the Wisconsin state line. Then US 51 follows Illinois Route 75 (IL 75) west to the intersection of IL 251, and then turns north through South Beloit, Illinois to enter Wisconsin.