What should you do when you encounter a roundabout?

When you encounter a roundabout, the proper action is to yield to traffic that is already circulating within the roundabout and navigate it in a counterclockwise direction. This approach allows for a smoother flow of traffic and reduces the risk of collisions. By yielding, you ensure that you only enter the roundabout when it is safe to do so. Navigating counterclockwise aligns with the circular traffic pattern, helping drivers maintain awareness of their surroundings and other vehicles.

The other options present methods that would either disrupt traffic flow or create unsafe driving situations. Speeding through without stopping disregards the critical rule of yielding, which can lead to accidents. Stopping and waiting for traffic to clear can result in confusion or unnecessary delays, as roundabouts are designed for continuous flow. Making a U-turn is inappropriate because roundabouts are not intended for such maneuvers; instead, they should be used to change direction safely.