When you approach a roundabout, you should yield to which vehicles?

When approaching a roundabout, the correct protocol is to yield to vehicles that are already circulating within the roundabout. This is because these vehicles have the right of way; they are in a position where they are continuing along their path and should not have to adjust for incoming traffic. By yielding to them, you help maintain the flow of traffic and reduce the likelihood of accidents that could occur if vehicles were to merge without yielding appropriately.

It's important to recognize that vehicles entering the roundabout need to wait for a safe gap in the traffic already in the roundabout before they can proceed, making it crucial for incoming traffic to yield until it is safe to enter. This system of yielding helps ensure that the roundabout operates smoothly and efficiently, minimizing stop-and-go traffic and enhancing safety for both vehicles and pedestrians.