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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).
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.
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 ...
Since the 1950s, US 24 through Illinois and Missouri has been considered as one route of various Chicago to Kansas City federal Interstate proposals (1956, 1968, 1972). None of these proposals received federal funding or support. Portions of US 24 are incorporated in the Chicago–Kansas City Expressway. This highway involved new signage ...
Interstate 70 (I-70) is a part of the Interstate Highway System that travels from Cove Fort, Utah, to Baltimore, Maryland.In the US state of Illinois, the highway travels 160 miles (260 km) from the Missouri state line at the Mississippi River in Brooklyn east to the Indiana state line near Marshall.
U.S. Route 12 (US 12) in the U.S. state of Illinois is an arterial highway that runs northwest to southeast through the Chicago metropolitan area.It enters Illinois at the Wisconsin border north of Richmond, and exits into Hammond, Indiana, from Chicago near the foot of the onramp to the Indiana Toll Road (Interstate 90, or I-90); as it exits Illinois, the route is also concurrent with US 20 ...
Interstate 55 (I-55) is a major north–south Interstate Highway in the US state of Illinois that connects St. Louis, Missouri, to the Chicago metropolitan area.It enters the state from Missouri near East St. Louis, Illinois, and runs to U.S. Route 41 (US 41, Lake Shore Drive) near Downtown Chicago, where the highway ends, a distance of 294.38 miles (473.76 km). [2]
In the 1920s, two state highways followed the general alignment that I-80 takes. In 1932, US Route 6 (US 6) was extended through Illinois, paralleling the alignment that I-80 in Illinois takes today. Construction started in 1957, and I-80 was completed in 1968. In the early 1990s, Illinois wanted to reroute I-80 in the Quad Cities area.