A roundabout is a circular intersection where traffic flows counterclockwise around a central island, with entering vehicles yielding to those already circulating. Modern roundabouts differ from older traffic circles by being smaller and designed for slower speeds, making them safer and more efficient. Benefits include reduced collision severity (no right-angle crashes), lower speeds, continuous traffic flow without signals, and reduced fuel consumption from fewer stops. Roundabouts require less maintenance than signalized intersections. Municipalities increasingly install roundabouts, though public education is needed where they're new. Design considerations include traffic volumes, pedestrian safety, and space requirements.