| Illinois Department of Transportation: The official site of the department. Includes information on construction projects and information about doing business with the department. |
| Illinois Highways Page: A guide to the origin and evolution of the numbered system. Includes route logs and other trivia. |
| 336 Coalition: Supports a four-lane highway running from Peoria to Macomb. |
| Chicago Department of Transportation: Offers news, real time traffic information and weekly bulletins, projects and programs, and information on bureaus of highways, streets, traffic, signs and markings, bridges and transit, inspections, and administration and planning. |
| Chicago Skyway: Official site of the company that now leases the toll route in southeast Chicago. Site includes history and toll information. |
| CookExpressways.com: Covers the history of the system in Cook County, including Chicago. |
| Expressways: Entry from the Encyclopedia of Chicago. Gives historic background and includes a map. |
| Illinois Land Use: Environmental Law and Policy Center of the Midwest site against construction of new tollways (and other out of state highways). |
| Illinois Tollway Oases: Then and Now: History and details of these unusual service areas. |
| Lake Michigan Circle Tour: Contains resources related to this scenic drive around the lake. |
| Marshall County Highway News From the Past: Contains news articles from the late 1920s and early 1930s. |
| Revive 755's Transportation Pages: Contains information about old plans in the St. Louis, Missouri, metropolitan area. |
| Spoon River Drive: Organization promoting this scenic route in Fulton County which was the setting of Edgar Lee Master's "Spoon River Anthology". Contains maps and other information. |
| The Cape Rock - Roads and Highways: A guide to the roads and highways around Cape Girardeau, Missouri including roads in southern Illinois. |
| The Illinois Tollway: Information on the system, including the I-Pass electronic toll collection system. |
| The Road Ahead: A look at old road maps including scans from 1920s era maps showing early alignments of US 60 in Illinois. |
| The Transportation Pages: Aaron Renn's information and opinions on Chicago area commuting. |
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