This report reviews current research and practice on modern roundabouts, both in the US and other countries. The report compares the advantages and disadvantages of roundabouts, summarizes safety implications, and discusses pedestrian and bicyclist considerations. Guidance from other states on the geometric design of roundabouts is reviewed, as are studies and formulas used to evaluate roundabout performance, measuring capacity and delay. Software models for roundabouts are reviewed. The report makes recommendations for considering and using roundabouts in Oregon, as well as identifying further research needs in this area.
United States. Federal Highway Administration. Office of Safety
2014-03-01
Abstract:
Roundabout intersections are purposely designed to improve safety and efficiency through a combination of geometry and traffic control that results in...
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United States Department of Transportation
[PDF-1.28 MB]
