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Originally Chicago to St. Louis, mostly replaced by US 66 except from Springfield to Staunton where IL 4 was used on the old road and US 66 on the new; IL 4 replaced the old IL 43 Staunton to near Murphysboro IL 4A — — — — 1925: 1967 Ran Chicago to Joliet along Archer Av., Replaced by IL 171: IL 5 — — — — 1918
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).
Prior to 1938, US 20 continued east on Lake Street east of Mannheim Road (US 12/US 45). It ran through downtown Chicago and exited Chicago south on what is now Torrence Avenue. [3] In 1955, the Illinois General Assembly designated the entire length of US 20 in Illinois the "U.S. Grant Memorial Highway". New signs were produced in late 2007 to ...
I-70/US 40 near Marshall: 1926: current National Road: US 41: 64.81: 104.30 US 12/US 20/US 41 in Chicago: I-94/US 41 near Russell: 1926: current Brian Piccolo Memorial Highway US 45: 428.99: 690.39 US 45 near Brookport: US 45 near Antioch: 1926: current US 50: 165.79: 266.81 I-255/US 50 in Columbia: US 50 in Lawrenceville: 1926
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 ...
Illinois Route 72 cross-sign mounted on a stoplight in Hoffman Estates. SBI Numbers are still used for several purposes, even when they do not match the posted number. IDOT District maps still refer to SBI numbers on the various roads it maintains, along with other non-posted designations that refer to how the route was authorized.
US 12 and US 45 remain concurrent on Mannheim Road, passing Interstate 294 again without an interchange, but, after passing Illinois Route 19 (Irving Park Road), has a full interchange with Interstate 190, which leads directly to O'Hare International Airport or Interstate 90 East (into Chicago). This area between IL19 and IL72 once ran straight ...
In Decatur, US 51 follows I-72 to bypass the city. US 51 leaves I-72 after eight miles (13 km), and it heads north to Bloomington – Normal as an expressway. At Bloomington–Normal, US 51 follows I-74 for a mile, then I-55 for seven miles (11 km), before following I-39 for 140 miles (230 km).