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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'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 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).
Illinois Highway Ends by Charles Sarjeant, photographs of ends, multiplexes and signs - maps - descriptions of current routes and history - links relevant to Illinois highways. 1970 map of Cook County; Link to maps dating back to 1917; Illinois county, city and township highway maps /Lengths; All-time list
U.S. Route 40 (US 40) runs east–west across south central Illinois for 159.8 miles (257.2 km). US 40 enters the state from Missouri across the Poplar Street Bridge over the Mississippi River at East St. Louis concurrent with Interstate 55 (I-55) and I-64 and exits just south of State Line, Indiana, running concurrently with I-70.
U.S. Route 45 (US 45) in the state of Illinois is a major north–south U.S. Highway that runs from the Brookport Bridge over the Ohio River at Brookport north through rural sections of eastern Illinois and then through the suburbs of Chicago to the Wisconsin state line east of Antioch.
Illinois Route 98 (IL 98, Route 98) is an 8.36-mile (13.45 km) east–west state highway located entirely within Tazewell County in central Illinois. [1] The route runs from Route 29 on the border of Pekin and North Pekin east to Interstate 155 (I-155) in Morton .
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.