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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 has used letter suffixes on several state highways, including "A", "B". "C", "N" (for north) and "S" (for south). [ 2 ] A, B and C suffixes were used for spurs of a nearby route, the N and S were legs of IL 113 on either side of the Kankakee River .
AASHTO does, however, apply similar standards as to new U.S. Highways, requiring a new business Interstate to meet certain design standards. [2] Business Interstates are more commonly found in the western regions of the United States, as well as both across the Great Plains and in the state of Michigan.
Eastern end of IL 26/Illinois River Road/Ronald Reagan Trail overlap: Selby Township: 64.9: 104.4: I-180 to I-80 – Hennepin: I-180 exit 3: Depue Road - DePue: former US 6 east; state maintained: Spring Valley: 73.6: 118.4: IL 89 north – Ladd: Western end of IL 89 overlap: 75.6: 121.7: IL 29 / Illinois River Road south – DePue: Western end ...
The state of Illinois uses exit numbers on three freeways, on Illinois Route 6 (IL 6) between in Peoria, IL 390 in the northwestern suburbs of Chicago, and IL 255 in the suburbs of St. Louis. The state of Indiana uses exit numbers on two highways with freeway segments, on US 31 between Indianapolis and South Bend and SR 912 in northwest Indiana.
The DuPage County Highway System is a county-maintained system of arterial county highways in DuPage County, Illinois, United States.They are marked with the standard M1-6 [1] pentagon-shaped highway marker on the base of traffic signals at intersections with other county highways.
In the 1920s, two state highways followed the general alignment that I-80 takes. In 1932, US Route 6 (US 6) was extended through Illinois, paralleling the alignment that I-80 in Illinois takes today. Construction started in 1957, and I-80 was completed in 1968. In the early 1990s, Illinois wanted to reroute I-80 in the Quad Cities area.
Illinois Route 6 is a 4-lane freeway entirely in Peoria County in central Illinois. It begins as a northern extension of Interstate 474 at Interstate 74 west of Peoria, and ends at Illinois Route 29 at the 9th Mile in Mossville, south of Chillicothe. The freeway currently has a total length of 10.11 miles (16.27 km), including the connector ...