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As the highway system grew these numbers were altered to accommodate new roads or extensions of older roads. In 1924, additional State Bond Issues were authorized for SBI Routes 47 through 185. These route numbers were originally assigned and grouped to specific regions of the state.
Grand Army of the Republic Highway US 12: 85.14: 137.02 US 12 near Richmond: US 12/US 20/US 41 in Chicago: 1928: current US 14: 69.55: 111.93 US 14 near Harvard: US 41 in Chicago: 1933: current Ronald Reagan Highway / Northwest Highway US 20: 233.93: 376.47 US 20 in East Dubuque: US 12/US 20/US 41 in Chicago: 1926: current
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).
In 1971, US 30 Alt. in Illinois was discontinued, renamed as IL 38 west of Westchester, and dropped through the city of Chicago. [ 2 ] Since a 2008 realignment, US 30 passes a mile (1.6 km) to the north of downtown Plainfield on 143rd Street, then turns south onto IL 59 (Division Street) for approximately one mile (1.6 km).
Inventory Route Number sign near Jacksonville IL (Morgan County) on US-67. Illinois uses unique "inventory number" signage on rural roads that are owned or maintained by IDOT but may or may not be part of the US or Illinois highway systems. These number signs are white squares, with a green divided circle.
In 1918, Illinois voters approved a 48-route state highway system. Among the new routes was Route 3, which connected Morrison and Chester by way of the Quad Cities, Monmouth, Beardstown, Jacksonville, Alton, and East St. Louis. US 67 was created in 1926, but it did not extend into Illinois until 1931.
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U.S. Route 54 (US 54) in Illinois is a 23.9-mile-long (38.5 km) east–west highway that travels from the Champ Clark Bridge on the Missouri state line to I-72/US 36/IL 107 south of Griggsville. At its greatest extent, US 54 used to continue east to Springfield , then northeast to Onarga , and then north all the way to Downtown Chicago .