Final answer:
Road signs for circular intersections with a center island indicate that entering traffic must yield the right-of-way to vehicles already in the circle; the island is not a parking area, and passing inside the circle is generally not advisable.
Step-by-step explanation:
Road signs indicating circular intersections with a central island, commonly known as roundabouts or traffic circles, have specific rules for drivers. The correct interpretation for these signs is that entering traffic must yield the right-of-way to traffic already in the circle. This advice helps to maintain a smooth and continuous flow of traffic within the roundabout and prevents collisions. It also ensures that vehicles already navigating the circle can do so without unexpected stops, which can reduce traffic congestion and increase safety. The central island is not a parking area, and generally, passing is not advisable within the circle due to the single-lane traffic flow around the island.