Interstate 80 in Illinois

Interstate 80
Route information
Maintained by IDOT and ISTHA
Length:	163.41 mi (262.98 km)
Existed:	1967 – present
Major junctions
West end:	I-80 at East Moline
	I-88 / IL 5 / IL 92 / IL 110 (CKC) in East Moline I-74 / I-280 / IL 110 (CKC) in Colona I-180 in Princeton I-39 / US 51 in LaSalle I-55 in Joliet I-355 in New Lenox I-57 in Country Club Hills I-294 in Hazel Crest I-94 / I-294 / IL 394 in South Holland
East end:	I‑80 / I‑94 / US 6 at Lansing
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Illinois State Highway System Interstate U.S. State Tollways ← IL 78 IL 81 →

Interstate 80 (I-80) is a part of the Interstate Highway System that runs from San Francisco, California, to Teaneck, New Jersey. I-80 enters Illinois from Iowa in the west, southwest of Rapids City and runs generally eastward through East Moline, LaSalle and Joliet, before entering Indiana in Lansing. The interstate runs for approximately 163.41 miles (262.98 km) through the state.

In the 1920s, two state highways followed the general alignment that I-80 takes. In 1932 US 6 was extended through Illinois, paralleling the alignment that I-80 in Illinois. 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. At the same time the section of I-80 that is concurrent with I-294, reconstructed. The partition of I-80 that is concurrent with the Kingery Expressway was rebuilt in the mid-2000s.

Interstate 80 extends from west to east across the northern portion of the state through the population centers of Quad Cities and the south Chicago suburbs. The freeway is mostly maintained by Illinois Department of Transportation (IDOT), with Illinois State Toll Highway Authority (ISTHA) maintaining the section of I-80 that is concurrent with the Tri-State Tollway. The busiest section of the freeway is between I-94 and IL 83 interchanges in Lansing approximately 181,200 vehicles used the freeway on average each day in 2011; in contrast the lowest traffic level was 16,400 vehicles between the IL 78 and IL 40 interchanges in Henry and Bureau Counties. I-80 contains between a minimum of four lanes and a maximum of ten lanes total. The majority of the highway runs through farmland and urban areas.

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