What is indicated when a roundabout sign is present?

When a roundabout sign is present, it signifies that there is a roundabout you must enter. This sign serves as a proactive alert to drivers, informing them that they will be encountering a circular intersection designed to improve traffic flow and enhance safety. Roundabouts operate on the principle that vehicles circulating in the roundabout have the right of way, while incoming traffic must yield. Recognizing this sign helps prepare drivers for the unique navigation required within a roundabout, promoting a smoother traffic experience.

The other options do not accurately reflect the implications of a roundabout sign. For example, yielding to oncoming traffic (as implied in one alternative) is only relevant once a driver is about to enter the roundabout; it does not indicate the presence of a roundabout itself. Similarly, stating that the road ahead is closed or that roundabouts are prohibited does not align with the purpose of the roundabout sign, which is specifically to inform about the circular intersection ahead.