The Interstate Highways in Illinois are all segments of the
Interstate Highway System
The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National Hi ...
that are owned and maintained by the U.S. state of
Illinois
Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. It borders on Lake Michigan to its northeast, the Mississippi River to its west, and the Wabash River, Wabash and Ohio River, Ohio rivers to its ...
.
The
Illinois Department of Transportation
The Illinois Department of Transportation (IDOT) is a state agency in charge of state-maintained public roadways of the U.S. state of Illinois. In addition, IDOT provides funding for rail, public transit and airport projects and administers f ...
(IDOT),
Illinois State Toll Highway Authority
The Illinois State Toll Highway Authority (ISTHA) is an administrative agency of the U.S. state of Illinois charged with building, operating, and maintaining toll roads in the state. The roads, as well as the authority itself, are sometimes refer ...
(ISTHA), and
Skyway Concession Company (SCC) are responsible for maintaining these highways in Illinois. The Interstate Highway System in Illinois consists of 13
primary highways and 11
auxiliary highways which cover .
The Interstate Highway with the longest section in Illinois is
Interstate 57
Interstate 57 (I-57) is a north–south Interstate Highway that exists in two segments. It runs through Arkansas, Missouri, and Illinois. I-57 parallels the old Illinois Central Railroad for much of its route north of Interstate 55, I-55. T ...
at ; the shortest is
Interstate 41
Interstate 41 (I-41) is a north–south Interstate Highway connecting the interchange of I-94 and U.S. Route 41 (US 41), located about south of the Wisconsin–Illinois border at the end of the Tri-State Tollway in metropoli ...
at .
Primary Interstate Highways
Auxiliary Interstate Highways
Business loops
See also
*
*
References
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Interstate
The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National H ...