مزايا محطم gyratory. مزايا محطم gyratory[اضغط لتتعلم المزيد] Roundabout . 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 is permitted to flow in one direction around a central island, and priority is given to traffic already on the junction.