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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]
Serves Chicago; Formerly designated as City US Route 20 City US 30 — — — — 1959: 1960 Served Aurora: US 30 Bus. — — — — 1960: 1970 Served Aurora; Formerly designated as City US Route 30 US 30 Toll — — Aurora: Ford Heights — — US 30 Alt. — — — — 1942: 1971 Served Chicago; Formerly designated as US Route 330 US 40 ...
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 ...
U.S. Route 50 (US 50) in the state of Illinois is an east–west highway across the southern portion of the state. It runs from the Jefferson Barracks Bridge, over the Mississippi River, to Missouri east, to the Red Skelton Memorial Bridge, over the Wabash River and to Indiana. This is a distance of 165.79 miles (266.81 km).
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.
U.S. Route 150 (US 150) in Illinois is a 267.47-mile-long (430.45 km) east–west highway that runs from US 6 near the Quad City International Airport in Moline to the Indiana state line near Vermilion. [1] It closely parallels Interstate 74 (I-74) between Moline and Danville.
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 20 (US 20) in the U.S. state of Illinois is a major arterial highway that runs from the Iowa state line at East Dubuque at the northwestern tip of Illinois to the Indiana state line at Chicago south of the Chicago Skyway, a distance of 233.93 miles (376.47 km). [1]