How do roundabouts enhance safety?

Answer: B — By reducing the likelihood of head-on collisions

Roundabouts enhance safety primarily by reducing the likelihood of head-on collisions. This is because roundabouts facilitate a continuous flow of traffic while requiring vehicles to travel in the same circular direction. When vehicles approach a roundabout, they must slow down and yield to traffic already circulating, which significantly decreases the potential for serious collisions. The design of a roundabout minimizes the points at which vehicles can collide, primarily preventing direct impacts that often occur with traditional intersections, such as head-on or T-bone accidents. While other options may touch on aspects of traffic management or flow, they do not directly contribute to the core safety benefits provided by roundabouts. For instance, higher speeds can increase the severity of accidents, eliminating traffic lights may disrupt other traffic controls, and adding more lanes could complicate navigation rather than enhancing safety.