Roundabouts and Traffic

Annual Average Daily Traffic (AADT) is the total volume of traffic on a highway segment for one year, divided by the number of days in the year. Both directions are included.

To view Annual Average Daily Traffic (AADT) counts for Illinois roads with an ability to zoom in on O’Fallon roads, this site is offered by the Illinois Department of Transportation (IDOT).

Frequently Asked Questions

This Video will help you better understand how to navigate a Roundabout.  The video is from the Missouri Department of Transportation.

Driving Modern Roundabouts Video - The link leads to a great presentation produced in cooperation with The City of Lacey, City of Olympia and Washington Department of Transportation. This is a large file 73M. It will take some time to load

Insurance Institute for Highway Safety - Video from Insurance Institute for Highway Safety. Questions and Answers.

Roundabouts: An Informational Guide - The Federal Highway Administration offers this guide on their web site. It's a great resource for learning about all aspects of planning, operation, and design of a roundabout.

Additional Information and examples of other existing roundabouts - Context Sensitive Solutions, a transportation facility planning company, uses roundabouts to solve many traffic congestion problems. Their web site discusses situations where they are appropriate and provides examples of successful roundabout use.

Article from Public Works online - O'Fallon was featured in a National Publication! This article describes how choosing the use of a roundabout at State and Oberneufemann is ideal for the location. Additionally, a summary about how it came to be is spelled out.

Roundabout Brochure - U.S. Department of Transportation Federal Highway Administration Brochure.

Learn about road safety on our nation's highways from Ima Cone. Professional Traffic Graphics created these fun materials to help kids learn about road and work zone safety.