A circular island located in the center of intersections of roadways, discouraging through traffic and forcing drivers to reduce travel speed as they maneuver around the island. These circles often are used as traffic-calming devices, but they also can serve as interesting focal points in long street vistas, if they are well landscaped and incorporate fountains, statues or other appealing structures.

A junction of roads that form a circle around which traffic normally moves in one direction. (DOI3)

a road junction at which traffic streams circularly around a central island; "the accident blocked all traffic at the rotary"

roundabout

a left-curving street with several side streets going off to the right

a natural kill zone