Strategies for Effective Roundabout Speed Reduction

Status:  Complete
Report Date:  12/29/2022


Appropriate deceleration on approaches to roundabouts is primarily accomplished through the use of applicable geometric design principles. However, traffic control devices (specifically signing and markings on approach) also serve a vital role in communicating to the approaching driver what speed profile should be anticipated. This research provides a resource for engineers to identify and select appropriate speed-reduction treatments for high- speed approaches to roundabouts. It examines best practices and techniques that are the most effective at lowering approach speed.

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