What should you always do when approaching a roundabout?

When approaching a roundabout, the primary action required is to yield to traffic already circulating within the roundabout. This ensures a smooth flow of traffic and minimizes the risk of collisions. Vehicles that are already in the roundabout have the right of way, allowing them to continue without interruption.

Yielding helps drivers assess the traffic conditions inside the roundabout and only proceed when it is safe to do so. This practice is critical for maintaining safety, as roundabouts are designed to reduce speed and potential conflict points compared to traditional intersections.

The other choices involve unsafe practices: accelerating into the roundabout increases the risk of accidents, driving against traffic is potentially catastrophic, and stopping unnecessarily can disrupt the flow of the roundabout and create hazards for both the stopping vehicle and others. Therefore, yielding is the safest and most effective approach when navigating roundabouts.