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Number series vary between IDOT Districts, in some areas the number used on otherwise unnumbered routes are a derivative of the former number (i.e.: "913" used on a section of former IL 13) or a sequential number unrelated to the original or former number (such as the 8900 series numbers used in the Galesburg–Macomb area). On many US and ...
Bridge weight plates refer to SBI numbers instead of posted route numbers as well. For example, bridge plates along old US-66 refer to the route as "SBI-4" When the United States Numbered Highway System was started in 1926, the US numbers were just tacked onto the existing IL/SBI number unless the US Route was routed along a new route.
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 Alt. — — — — 1948: 1967 Served Greenville-Vandalia: US 40 Byp. — — Chain of Rocks Bridge: US 40 in Troy: 1938: 1965
At the eastern end of the Quincy Memorial Bridge, eastbound US 24 overlaps Illinois Route 57 (IL 57) northbound (4th Street) for two blocks before IL 57 ends at IL 104 (Broadway) and westbound US 24 turns off onto the bridge at the northern terminus of IL 57. US 24 continues north at IL 104 and serves only the northwestern portion of Quincy.
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 ]
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]
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.
All known numbered Illinois state routes; Notable non-Interstate highways (Elgin-O'Hare Expressway, Kingery Highway) Interstate and U.S. Route state-level detail pages (U.S. Route 20 in Illinois) Lists of Illinois county highways (List of County Highways in DuPage County, Illinois) Historical road trails (Lincoln Highway, Cannon Ball Route)