When approaching a roundabout, which vehicles have the right of way?

Vehicles already on the roundabout have the right of way because roundabouts are designed to facilitate smooth traffic flow. When you are approaching a roundabout, you should yield to vehicles that are already circulating within it. This rule helps to prevent collisions and ensures that traffic moves efficiently through the roundabout.

In practice, when you approach a roundabout, you will typically see yield signs guiding your actions. Yielding to traffic that is already on the roundabout allows for continuous movement, reducing congestion and enhancing safety. If vehicles entering the roundabout had the right of way, it would lead to confusion and potential accidents, as it would create unnecessary stopping and starting.

It's also important to note that while emergency vehicles generally have priority in many traffic situations, they still respect the established rules of roundabout right-of-way unless they are responding to an emergency, in which case they would typically use lights and sirens to signal their presence.