Which statement is true when driving in a roundabout?

When driving in a roundabout, it is true that the vehicle already in the roundabout has the right of way. This design helps to maintain a continuous flow of traffic and reduces the likelihood of collisions, as it minimizes the need for vehicles to stop. The vehicles that are already circulating within the roundabout should be allowed to proceed without having to yield to those entering the roundabout.

This approach contrasts with other traffic situations where entering vehicles typically yield to the ones already on the road. The expectation is that drivers entering a roundabout must look for gaps in traffic and only proceed when it's safe to do so. This system has proven effective in enhancing safety and efficiency in traffic management.