How can you recognize you are approaching a roundabout?

Recognizing that you are approaching a roundabout is primarily indicated by the presence of yield signs as well as the visual characteristics of circular intersections that typically include a central island. Yield signs alert drivers that they need to slow down and be prepared to give way to traffic already circulating in the roundabout. The circular design itself, often marked with road markings and sometimes landscaped islands in the middle, visually signals to drivers that they are entering a priority-driven intersection where traffic flows in a circular motion.

The other options do not reliably indicate the approach of a roundabout. For instance, flashing yellow lights may indicate various conditions but do not specifically point to the presence of a roundabout. The absence of other vehicles is not a dependable indicator either, as traffic conditions can vary greatly. Likewise, traffic lights switching to green typically signify standard intersections rather than roundabouts, where traffic flow is managed differently. Thus, recognizing the specific features associated with roundabouts is crucial for safe navigation.