They allow U-turns within the normal flow of traffic, which often are not possible at other forms of junction. Other benefits include reduced driver confusion associated with perpendicular junctions and reduced queuing associated with traffic lights. Traffic moves slowly enough to allow visual engagement with pedestrians, encouraging deference towards them. Variations on the basic concept include integration with tram or train lines, two-way flow, higher speeds and many others.įor pedestrians, traffic exiting the roundabout comes from one direction, instead of three, simplifying the pedestrian's visual environment. Compared to stop signs, traffic signals, and earlier forms of roundabouts, modern roundabouts reduce the likelihood and severity of collisions greatly by reducing traffic speeds and minimizing T-bone and head-on collisions. Įngineers use the term modern roundabout to refer to junctions installed after 1960 that incorporate various design rules to increase safety. Movement within a roundabout in right-hand traffic note the anticlockwise circulation Movement within a roundabout in left-hand traffic note the clockwise circulation The Hotel Indonesia Roundabout in Jakarta, IndonesiaĪ roundabout, also known as a rotary or traffic circle, is a type of circular intersection or junction in which road traffic is permitted to flow in one direction around a central island, and priority is typically given to traffic already in the junction. For the glaciated area in Antarctica, see Traffic Circle (Antarctica).
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