<Tr> <Td> </Td> <Td> It has been suggested that Traffic circle be merged into this article . (Discuss) Proposed since March 2018 . </Td> </Tr> <P> A roundabout, also called a traffic circle, road circle, rotary, rotunda or island, is a type of circular intersection or junction in which road traffic flows almost continuously in one direction around a central island . </P> <P> So - called "modern" roundabouts require entering traffic to give way to traffic already in the circle and optimally observe various design rules to increase safety . Compared to stop signs, traffic signals, and earlier forms of roundabouts, modern roundabouts reduce the likelihood and severity of collisions by reducing traffic speeds and minimizing T - bone and head - on collisions . Variations on the basic concept include integration with tram and / or train lines, two - way flow, higher speeds and many others . </P> <P> Traffic exiting the roundabout comes from one direction, rather than three, simplifying the pedestrian's visual environment . Traffic moves slowly enough to allow visual engagement with pedestrians, encouraging deference towards them . Other benefits include reduced driver confusion associated with perpendicular junctions and reduced queuing associated with traffic lights . They allow U-turns within the normal flow of traffic, which often are not possible at other forms of junction . Moreover, since vehicles on average spend less time idling at roundabouts than at signalled intersections, using a roundabout potentially leads to less pollution . When entering vehicles only need to give way, they do not always perform a full stop; as a result, by keeping a part of their momentum, the engine will produce less work to regain the initial speed, resulting in lower emissions . Research has also shown that slow moving traffic in roundabouts makes less noise than traffic that must stop and start, speed up and brake . </P>

Who has right of way in round about