What action should you take when approaching a traffic circle?

When approaching a traffic circle, yielding to traffic already in the circle is the proper action to ensure safety and smooth traffic flow. This practice allows vehicles that are already circulating within the circle to proceed without interruption, which helps to prevent collisions and maintains the fluidity of movement.

Traffic circles, often designed to enhance safety and reduce congestion, operate on the principle that vehicles inside the circle have the right of way. By yielding, you assess the situation, ensuring it is safe to enter while allowing others to maintain their pace, thereby facilitating a more organized and efficient traffic pattern.

This approach contrasts with the other options, which involve either unnecessary acceleration, stopping in situations where flow is expected, or entering without regard for existing traffic, all of which could disrupt traffic and lead to accidents. Understanding this concept is crucial in navigating roundabouts and traffic circles successfully.