Final answer:
B.Yield to traffic already in the roundabout. Drivers must yield to traffic already in the roundabout to ensure traffic flows smoothly and safely. Vehicles should move in a counter-clockwise direction and avoid stopping within the roundabout.
Step-by-step explanation:
When using a roundabout or rotary island, drivers should heed specific rules to ensure safety and maintain traffic flow. The correct action for drivers is to yield to traffic already in the roundabout. This helps to prevent accidents and allows vehicles within the roundabout to continue their movement unimpeded. It is imperative to note that drivers should not yield to entering traffic; doing so could cause confusion and possible collisions. As for the direction of travel, in places where you drive on the right side of the road, you should always navigate the roundabout in a counter-clockwise direction. Stopping within a rotary island is also not advised as it could disrupt the flow of traffic and increase the risk of rear-end collisions. Roundabouts are designed to keep traffic moving smoothly and at a controlled pace, which often negates the need for a traffic signal that would require vehicles to stop.