Final answer:
It is true that drivers must yield to traffic already in the roundabout when entering. Yielding ensures safety and efficiency in traffic flow. Not yielding can cause accidents and disruptions.
Step-by-step explanation:
The statement is true: You must yield the right-of-way to traffic already in the circle as you enter a roundabout. When approaching a roundabout, it's essential for safety and traffic flow to give way to the vehicles that are already circulating. Drivers entering the roundabout are required to look to their left and ensure that it is safe to proceed before merging with the traffic in the circle. Failing to yield can result in collisions and disrupt the efficient function of the roundabout.