A traffic circle, also known as a roundabout, is a circular intersection where vehicles move in one direction around a central island. They are designed to improve traffic flow and reduce the likelihood of accidents by allowing vehicles to merge smoothly rather than stopping at traffic signals. In a traffic circle, vehicles already in the circle have the right of way, which helps to minimize delays. These structures can vary in size and complexity, accommodating different volumes of traffic. Traffic circles are often used in urban planning to enhance safety and efficiency on the roads.