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 About Roundabouts

Roundabouts are circular intersections that require all entering traffic to yield at entry.  Geometric features of a roundabout include channelized approaches, geometric curvature that ensures travel speeds within the roundabout are around 30mph or less, and diameters usually between 80ft to 200ft.  They are designed to be safer and more efficient than a traditional intersection.  The geometry creates a low speed (20-30mph) environment inside the circulatory roadway, as well as at the entry and exit locations.  The geometry also prevents high angle crashes such as “T-bone” and left turn angle crashes. Lower angle, low speed crashes tend to be less severe than higher angle, high speed crashes. 

More efficient operation results from the yield at entry – drivers only have to watch for traffic from the left, and if there is an adequate gap available, they can enter the roundabout without stopping.  Once in the roundabout, drivers have the right-of-way, so they will not have to stop or yield to exit.   If the driver does need to yield at entry to traffic inside the roundabout, their delays are brief and typically less than the time they would have been delayed at a traffic signal.

 Driving Roundabouts



 Contact Information


​For questions or comments regarding roundabouts in District 7, please contact:

Mary Hoy, P.E.
District Planning Department Traffic Engineer

ODOT District 7
1001 Saint Marys Avenue
Sidney, Ohio 45365

Phone: (937) 497-6838