What action should you take when approaching a roundabout?

When approaching a roundabout, the appropriate action is to yield to traffic already in the roundabout. This means slowing down and giving way to vehicles that are circulating so that you can merge safely. Roundabouts are designed to facilitate a continuous flow of traffic, reducing delays compared to traditional intersections, and yielding helps ensure that this flow is maintained.

By yielding, you allow vehicles already in the roundabout to pass, which helps prevent accidents and ensures a smoother transition into the roundabout when it is safe to do so. This practice reflects fundamental traffic rules that prioritize the safety and movement of drivers already in the intersection.

The other options do not align with safe practices for navigating a roundabout. For example, speeding up to exit quickly can create dangerous conditions, while turning on your signal immediately without considering your position could confuse other drivers. Stopping before entering without clear cause could lead to unnecessary delays and possibly disrupt the traffic flow of the roundabout.