Illinois Route 171
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| Route information | ||||
| Maintained by IDOT | ||||
| Length: | 38.61 mi (62.14 km) | |||
| Existed: | 1946 – present | |||
| Major junctions | ||||
| South end: |
 US 6 in Joliet
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 I-355 near Lockport   US 12 / US 20 / US 45 in Willow Springs I-294 in Justice I-55 in Summit US 34 in Lyons    I-290 / IL 110 (CKC) in Maywood I-90 in Chicago
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| North end: |
 IL 72 in Chicago
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| Location | ||||
| Counties: | Will, Cook | |||
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Illinois Route 171 (IL 171) is a north–south state road in northeastern Illinois. It runs from U.S. Route 6 (US 6) in Joliet north to Illinois Route 72 at the Chicago–Park Ridge border. This is a distance of 38.61 miles (62.14 km). The section of IL 171 on Archer Avenue from Joliet to Summit is historically significant, originating as a Native American trail, and later serving for a time as part of the first numbered highway between St. Louis and Chicago.
The current Illinois Route 171 incorporates part or all of previous IL 4, IL 4A, and IL 213.
IL 171 is mostly two lanes wide from Joliet to Willow Springs, and then four lanes wide to its northern endpoint in Chicago. It is a four-lane freeway for about 2 miles (3.2 km), from its intersection with West 55th Street and Archer Avenue in Summit, to its intersection with West 44th Place in Lyons.
IL 171 begins in Joliet as Collins Street, at an intersection with US 6 which is East Jackson Street. On its way out of town, it passes the historic Joliet Correctional Center, used as a location in several television shows and movies including The Blues Brothers. From Joliet to Lockport, it parallels the Des Plaines River, and IL 53 (which had formerly been US 66) on the other side of the river. It passes through historic Downtown Lockport as State Street, intersecting IL 7 at 9th Street.
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