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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 ...
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.
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]
SBI Route numbers that were superseded by other routes, US or state routes were often reused. For example, SBI Route 61 was originally assigned to a road segment in northeastern Illinois, but was reassigned to a route in western Illinois, sometime after 1937. Illinois Route 72 cross-sign mounted on a stoplight in Hoffman Estates
Given are the years of the first and last official maps the routes appear on (or when the route was legislated, in the case of SBI routes: original 1917 definitions, approved by voters in 1918; 47-185 from 1923 (pp. 258-268), approved in 1924). These are not always the exact years the routes were created or eliminated.
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
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