ROUND ABOUT

A roundabout 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

Engineers use the term modern roundabout to refer to junctions installed after 1960 that incorporate various design rules to increase safety.[3][2] Both modern and non-modern roundabouts, however, may bear street names or be identified colloquially by local names such as circle, road circle, traffic circle, rotary, rotunda, or island.

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.[4] Variations on the basic concept include integration with tram or train lines, two-way flow, higher speeds, and many others.