Transcription of Chapter 1320 Roundabouts
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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.
A splitter island is the raised island at each two-way leg between entering and exiting vehicles, designed primarily to control the entry and exit speeds by providing deflection. They also discourage wrong-way movements, and provide pedestrian refuge. Splitter islands can have different shapes based on entry angle
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