I-80 contains between a minimum of four lanes and a maximum of 10 lanes total. 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. The busiest section of the freeway is between the I-94 and Illinois Route 83 (IL 83) interchanges in Lansing. The freeway is mostly maintained by the Illinois Department of Transportation (IDOT) the Illinois State Toll Highway Authority (ISTHA) maintains the section of I-80 concurrent with the Tri-State Tollway. I-80 extends from west to east across the northern portion of the state through the population centers of the Quad Cities and south Chicago suburbs. The portion of I-80 that is concurrent with the Kingery Expressway was rebuilt in the mid-2000s. At the same time, the section of I-80 that is concurrent with I-294 was reconstructed. In the early 1990s, Illinois wanted to reroute I-80 in the Quad Cities area. Construction started in 1957, and I-80 was completed in 1968. In 1932, US Route 6 (US 6) was extended through Illinois, paralleling the alignment that I-80 in Illinois takes today. In the 1920s, two state highways followed the general alignment that I-80 takes. The Interstate runs for approximately 163.52 miles (263.16 km) through the state. 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. Interstate 80 ( I-80) is a part of the Interstate Highway System that runs from San Francisco, California, to Teaneck, New Jersey. Rock Island, Henry, Bureau, LaSalle, Grundy, Kendall, Will, Cook
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