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Managing Traffic Flow with Roundabouts

The Oregon Department of Transportation, local jurisdictions and consultants continue to look for traffic control methods that provide ways to safely manage the flow of traffic, bicycles and pedestrians through intersections large and small. Roundabouts are one such method. 

Roundabouts are a form of intersection design and control which:

  • Accommodates traffic flow in one direction around a central island;
  • Operates with yield control at the entry points; and
  • Gives priority to vehicles within the roundabout.

According to the Federal Highway Administration, roundabouts are safer than traditional intersections.

  • 90 percent reduction in fatalities
  • 76 percent reduction in injuries
  • 35 percent reduction in all crashes
Roundabouts also boast lower lifecycle costs and allow for increased fuel efficiency.
The FHWA has produced two informational videos about the use of roundabouts.

Guidance for Users

Guidance for Designers

Contact the Roadway Engineering Unit

4040 Fairview Industrial Drive, MS 5
Salem, Oregon 97302-1142
Phone: 503-986-3568
Fax: 503-986-3749

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