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Top Terms > Facilities > Transportation, hydraulic and utility facilities > Highway facilities > Roads > Parts of roads > Interchanges and intersections > Intersections > Types of intersections > Traffic circles > Roundabouts

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Roundabouts (Pmrcpjfcmr)

Scope Note
Usage restricted to redesigned traffic circles of the 1990s and beyond; for pre-1990 British roundabouts use: Traffic circles
Definition
Circular intersections with yield control of all entering traffic, channelized approaches with raised splitter islands, counter-clockwise circulation, and appropriate geometric curvature to encourage a travel speed on the circulating roadway of less than 30 mph. (Source: AASHTO Glossary)
Use For
Modern roundabouts
Broader Term
Traffic circles (Pmrcpjfcm)