What must motorists do when entering a roundabout?

Answer: A — Yield to traffic already in the roundabout

When entering a roundabout, it is essential for motorists to yield to the traffic that is already in the roundabout. This rule is crucial because roundabouts are designed to improve traffic flow and enhance safety by reducing the likelihood of high-speed collisions. By yielding, you allow vehicles already circulating in the roundabout to pass, ensuring a smoother transition and preventing potential accidents. In addition, yielding helps maintain the continuous movement that roundabouts facilitate. It effectively manages the entry points and helps avoid the confusion and delays that can occur if vehicles attempt to merge into the roundabout without yielding. Understanding this priority leads to safer driving behavior and contributes to the overall efficiency of the roundabout system.