When approaching a roundabout, what action should a driver take?

When approaching a roundabout, the driver should always yield to traffic that is already in the roundabout. This practice is crucial for maintaining a safe and orderly flow of vehicles. Vehicles within the roundabout typically have the right of way, which means that those entering must wait for a gap in traffic before proceeding. This helps to prevent accidents and ensures that the roundabout functions effectively by allowing continuous movement of vehicles.

Yielding also acknowledges that roundabouts are designed to facilitate efficient traffic flow while minimizing conflict points compared to traditional intersections. By recognizing the priority of vehicles already in the roundabout, drivers can contribute to smoother transitions and better overall traffic management.

The other actions mentioned in the choices do not align with safe driving practices near roundabouts. Entering without stopping can lead to collisions with vehicles already in the roundabout, signaling left upon entering may confuse other drivers about a potential U-turn, and speeding up to merge quickly increases the risk of accidents. Therefore, yielding is the most important action to ensure safety and compliance when approaching a roundabout.