Roundabout Information & Feedback

All About Roundabouts

Safety on Roundabouts

Roundabouts offer improved safety over other at-grade intersection forms because roundabouts have fewer conflict points, slower speeds, and easier decision making. When comparing a roundabout to a signal, studies show that roundabouts provide a 90% reduction in fatal crashes, 75% reduction in injury crashes, 30-40% reduction in pedestrian crashes, and 10% reduction in bicycle crashes.

Roundabouts improve pedestrian safety offering two simple crossings of one-way traffic moving at much slower speeds.


Roundabouts typically carry about 30% more vehicles than similarly sized signalized intersections during peak flow conditions. During off-peak conditions, roundabouts cause almost no delay, but traffic signals can cause delay to side street and left-turning traffic from the major street. Increased capacity at roundabouts is due to the continuously flowing nature of yielding only until a gap is available, versus waiting turns at a signal.
Capacity about Roundabouts

PA Roundabout Coordinator Contact Information
Jeffrey D. Bucher
Project Development Engineer

PA Department of Transportation
400 North Street, Harrisburg PA 17120-0094
Mail: PO Box 3161, Harrisburg PA 17105-3161
Phone: (717) 783-4586 Fax: (717) 705-2379
E-Mail: For Information and Feedback