What should a driver do if they approach a roundabout?

Answer: A — Yield to traffic already in the roundabout

When approaching a roundabout, a driver should yield to traffic already in the roundabout. This practice is crucial for maintaining a smooth flow of traffic and ensuring safety within the circular intersection. Vehicles inside the roundabout have the right of way, meaning that they are already committed to their path and must not be obstructed by incoming traffic. Yielding allows drivers to assess the situation, gauge the speed and distance of oncoming vehicles, and enter the roundabout safely when there is an adequate gap. Additionally, while other actions like signaling and stopping may be relevant in different contexts, yielding is the primary action needed when entering a roundabout. Stopping could disrupt the flow, and speeding up would likely lead to unsafe conditions. Signaling is typically reserved for indicating an exit from the roundabout rather than entry itself. Therefore, yielding to traffic already in the roundabout is the correct and safest course of action for a driver.