Chapter 1320 Roundabouts

WSDOT Design Manual M Page 1320-1 July 2017 Chapter 1320 Roundabouts General Roundabout Types Capacity Analysis Geometric Design Pedestrians Bicycles Signing Pavement Marking Illumination Road Approach, Parking, and Transit Facilities Geometric Design Peer Review Documentation and Approvals References General Modern Roundabouts are near-circular intersections at grade. They are an effective intersection type with fewer conflict points and lower speeds, and they provide for easier decision making than other intersection types. They also require less maintenance than traffic signals. Well-designed Roundabouts have been found to reduce crashes (especially fatal and severe injury collisions), traffic delays, fuel consumption, and air pollution. They also have a traffic-calming effect by reducing vehicle speeds using geometric design rather than relying solely on traffic control devices.

Chapter 1320 Roundabouts WSDOT Design Manual M 22-01.20 Page 1320-5 September 2021 1320.04(1)(b) Non-Circular A non-circular roundabout is a good choice when constraints such as right of way, existing roadway alignments,

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