What action should you take when approaching a roundabout?

When approaching a roundabout, yielding to traffic already in the roundabout is crucial for maintaining safety and ensuring smooth flow. This action helps prevent collisions and allows for an organized merging of vehicles. The traffic within the roundabout has the right of way, so by yielding, you provide those vehicles a clear path and minimize disruptions.

In a roundabout, vehicles are designed to circulate in one direction, which also helps in reducing the frequency and severity of collisions. By being mindful of the traffic that is already inside, you are facilitating a safer transition into the roundabout and supporting the overall traffic management.

The other suggested actions would lead to increased risks. Speeding up to merge quickly could result in dangerous situations as you may collide with vehicles already navigating the roundabout. Stopping completely before entering is unnecessary if there's no traffic to yield to and could cause confusion for other drivers. Using your horn could be perceived as aggressive and may not effectively communicate your intentions. Overall, yielding is the safest and most appropriate action when approaching a roundabout.