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Possible online services disruption due to Internet related outage

A worldwide technology outage is causing disruption to some State of Illinois online systems.  We are aware of this issue and are diligently working on restoration.

Agency Alert

Welcome to the new IDOT home page.  Our location has changed, please update any bookmarks.

Illinois Department of Transportation

Average Annual Daily Traffic

The Traffic maps listed below display the annual average daily traffic (AADT) on the State Primary system. The Primary system contains the roads that are marked as an Interstate, United States Route, or Illinois Route. These files are very large and may take a significant amount of time to download.

More detailed AADT counts are available on the interactive GIS application

Statewide Traffic Maps

Chicago Area Traffic Maps

East St. Louis Area Traffic Maps

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Contact Us

Illinois Department of
Transportation
Hanley Building
2300 S. Dirksen Parkway
Springfield, IL 62764

(217) 782-7820 or
TTY (866) 273-3681

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