List of Interstate Highways in Illinois explained

Interstate Highway System in Illinois
Shields:	State: IL Type: I Route: 57 State: IL Type: I Route: 294 State: IL Type: BL Route: 55
Caption:	Standard Illinois Interstate Highway markers
Maint:	IDOT, ISTHA, and SCC
Map Custom:	yes
Map Notes:	Interstate Highway system in Illinois
Length Mi:	2248.93
Formed:	^[1]
Statehwy:	Illinois Route X (IL X)
Interstate:	Interstate X (I-X)
Us:	U.S. Route X (US X)
Links:	IL

The Interstate Highways in Illinois are all segments of the Interstate Highway System that are owned and maintained by the U.S. state of Illinois.^[2] The Illinois Department of Transportation (IDOT), Illinois State Toll Highway Authority (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 2248.93miles.^[3] The Interstate Highway with the longest section in Illinois is Interstate 57 at 358.57miles; the shortest is Interstate 41 at 0.9miles.

Notes and References

1. Book: McNichol, Dan . McNichol . 2006 . The Roads that Built America . New York . Sterling . 1-4027-3468-9 . 106.
2. Web site: Staff . Interstate Frequently Asked Questions . . February 25, 2008.
3. Web site: Kevin . Adderly . January 15, 2014 . Table 3: Interstate Routes in Each of the 50 States, District of Columbia, and Puerto Rico . Route Log and Finder List . Federal Highway Administration . April 7, 2015 .