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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).
Inventory Route Number sign near Jacksonville IL (Morgan County) on US-67. Illinois uses unique "inventory number" signage on rural roads that are owned or maintained by IDOT but may or may not be part of the US or Illinois highway systems. These number signs are white squares, with a green divided circle.
Highway markers for Interstate 57, U.S. Route 45, Illinois Route 1 and the Chicago Skyway Overall map of system: freeways in light blue, tollways in green, other highways in yellow System information
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.
Interstate 90 (I-90) in the US state of Illinois runs roughly northwest-to-southeast through the northern part of the state. From the Wisconsin state line at South Beloit , it heads south to Rockford before heading east-southeast to the Indiana state line at Chicago .
Illinois also has two counties named after the same person, New York governor DeWitt Clinton (DeWitt County, and Clinton County). Information on the FIPS county code , county seat , year of establishment, origin, etymology , population, area and map of each county is included in the table below.
Interstate 94 (I-94) generally runs north–south through the northeastern portion of the US state of Illinois, in Lake and Cook counties. It is signed east–west in Illinois in accordance with its general alignment across the country, with west signage aligned with northbound travel and east signage aligned with southbound travel.
North of Interstate 55, US 12/20/45 becomes a regular 4-lane highway before it intersects with the former US 66 at Joliet Road in Countryside. In Downtown La Grange, US 12/20/45 intersects the Burlington Northern/Santa Fe railroad tracks and intersects with US 34 (Ogden Avenue), possibly the only intersection of 4 separate US routes in Illinois.