Illinois Route 171

Illinois Route 171
Illinois Route 171
	IL 171 highlighted in red
Route information
	Maintained by IDOT and CDOT
Length	38.61 mi (62.14 km)
Existed	1946–present
Major junctions
South end	US 6 in Joliet
	; I-355 Toll near Lockport; US 12 / US 20 / US 45 in Willow Springs; ; I-294 Toll in Justice; I-55 in Summit; US 34 in Lyons; ; I-290 / IL 110 (CKC) in Maywood; I-90 in Chicago
North end	IL 72 in Chicago
Location
Country	United States
State	Illinois
Counties	Will, Cook
Highway system
	Illinois State Highway System; Interstate; US; State; Tollways; Scenic;

Illinois Route 171 (IL 171) is a 38.61-mile-long (62.14 km) north–south state highway 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.^[1] 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.

^ ^a ^b Illinois Technology Transfer Center (2007). "T2 GIS Data". Illinois Department of Transportation. Retrieved January 3, 2009.
^ Cite error: The named reference 1946map was invoked but never defined (see the help page).

[t2-1] Illinois Technology Transfer Center (2007). "T2 GIS Data". Illinois Department of Transportation. Retrieved January 3, 2009.

[1946map-2] Cite error: The named reference 1946map was invoked but never defined (see the help page).

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