What is the purpose of a roundabout?

Answer: B — To improve traffic flow and reduce accidents

The primary purpose of a roundabout is to improve traffic flow and reduce accidents. Roundabouts are designed to facilitate continuous movement of vehicles while minimizing the need for complete stops. This design helps to maintain a steady flow of traffic, which can lead to reduced congestion compared to traditional intersections. Additionally, the circular design encourages vehicles to travel at slower speeds and requires them to yield to traffic already in the circle, which can significantly decrease the likelihood of high-speed collisions. By altering how vehicles interact at junctions, roundabouts have been shown to lower the number and severity of accidents, making them safer for both drivers and pedestrians. While increasing the number of lanes, creating waiting areas, or providing more parking spaces might be goals of some traffic management methods, they do not define the primary function of a roundabout. The focus on enhancing traffic efficiency and improving safety is what sets roundabouts apart in traffic design.