4.8 Roundabouts

Roundabouts can facilitate the interchange of relatively high volumes of traffic with shorter delays than might be experienced at other types of junctions. They are priority junctions, in effect a series of “T-junctions” arranged in a ring, and operate on the basis of gap acceptance. Roundabouts work as long as the circulating area and the exits do not back up.

Roundabouts can work well for cyclists and pedestrians but only if designed to specifically address their needs and expectations. Safety, and not capacity, is the over-riding principle for good roundabout design.