When approaching a roundabout, what should you do?

When approaching a roundabout, yielding to traffic already in the roundabout and proceeding when it is safe is the correct approach because roundabouts are designed to facilitate a smooth flow of traffic. Vehicles that are already circulating in the roundabout have the right of way, which helps prevent collisions and ensures that traffic moves efficiently.

Yielding allows you to assess the flow of traffic and merge safely, creating a safer environment for all road users, including pedestrians and cyclists. This method reduces the likelihood of sudden stops or accidents, which could occur if drivers were to enter without yielding.

The other choices would lead to confusion or unsafe conditions. Always yielding to traffic behind you, for instance, may not reflect the actual right-of-way rules and could create a backlog of vehicles. Entering without stopping if clear ignores the need to give way to circulating traffic. Finally, speeding up to merge could result in dangerous situations and conflicts if sufficient space isn't available. Thus, choice B encapsulates the key principle of ensuring safety and smooth traffic movement in roundabouts.