What is a roundabout?

A roundabout is an intersection control device that features traffic circulating around a central island. This design allows vehicles to yield to traffic already in the roundabout, promoting a continuous flow and reducing the likelihood of severe collisions that are often associated with traditional intersections where vehicles may come to a full stop or cross paths.

The roundabout's layout encourages drivers to navigate in a counter-clockwise direction around the central island, which effectively organizes the traffic and enhances safety by minimizing points of conflict between vehicles. Additionally, the slow speeds enforced by the circular design contribute to safer conditions for both drivers and pedestrians.

The other options refer to different traffic control measures or concepts that do not accurately describe the characteristics and functions of a roundabout. Understanding the specific design and purpose of a roundabout is crucial for recognizing its benefits in traffic management and safety.