Illinois Department of Transportation, Erica Borggren, Acting Secretary
Patrick J. Quinn, Governor
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Illinois' 139,000-mile network of state and local roads is the third largest in the nation.  The state also has the third largest interstate highway system, including three of the nation's five transcontinental routes that carry the most commercial vehicles.

IDOT is responsible for nearly 17,000 miles of roads.  The state also has 26,000 bridges, and IDOT is responsible for 8,000 of them.  Although IDOT is responsible for 12.5 percent of the total highways and 30 percent of the bridges, those roads and bridges carry two-thirds of the state's traffic.   


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