What is the correct action when approaching a roundabout?

When approaching a roundabout, the appropriate action is to yield to traffic that is already within the roundabout. This is crucial because vehicles inside the roundabout have the right of way. Yielding allows for a smooth flow of traffic and helps prevent collisions. It also ensures that the roundabout operates efficiently, as entering without yielding can disrupt the established traffic pattern and create confusion among drivers.

The other options suggest actions that could lead to unsafe situations on the road. Accelerating to merge quickly may put you at risk of not effectively assessing the gaps in traffic. Waiting for a green light is not applicable since roundabouts generally do not have traffic lights; they rely on the yield rules to dictate the flow of traffic. Entering without yielding is dangerous and can result in accidents, as it disregards the rights of those already navigating the roundabout.