The Federal Highway Administration (FHWA) has sponsored a research project, entitled "Field Testing, Marketing, and Crash Analyses for Mini-Roundabouts," Contract No. DTFH61-09-C-00027. We are actively recruiting willing agencies to identify suitable sites and implement this low cost treatment for evaluation.
Compared to a conventional roundabout, the mini-roundabout features a much smaller inscribed diameter, on the order of 50 to 80 ft, and a relatively small circular central island (e.g., 16 ft to 45 ft diameter) that is traversable. It is suitable for urban and suburban intersections of 2-lane roads with low truck volume and lower speed, and can handle traffic up to 1,600 vph (all approaches combined). Mini-roundabouts are designed to fit within existing travelway boundaries. A detailed marketing video and brochure on mini-roundabouts are available for download and can be freely distributed to interested agencies.
The FHWA contract provides resource to conduct comprehensive evaluation of the following safety and operational effectiveness of mini-roundabouts: actual approach and circulating vehicular speeds, traffic operations, driver behavior, vehicle-vehicle conflicts, pedestrian and bicyclist accommodation, and before/after crash analyses. We expect to work closely with participating agencies to provide technical support related to the implementation of mini-roundabouts.
If you are interested in participating in this study, need additional information, or desire a follow up call from the sponsoring agency, please contact:
Wei Zhang, Ph.D., P.E.
FHWA Safety R&D
Joe Bared, Ph.D., P.E.
FHWA Operations R&D