What is a common sign of an approaching roundabout?

A yield sign is commonly used to indicate an approaching roundabout. This sign advises drivers to yield to the traffic already circulating within the roundabout, ensuring a smooth flow and minimizing potential collisions. Yielding is essential because vehicles inside the roundabout have the right of way, and drivers entering must assess the flow of traffic before merging.

In the context of traffic signs, while a circular sign may represent the roundabout itself, it does not specifically instruct drivers on how to behave approaching the roundabout. A stop sign, on the other hand, suggests a complete halt, which is not typically required before entering a roundabout; instead, drivers should slow down and prepare to yield. Therefore, the yield sign is the most accurate indicator of the necessary action as one approaches a roundabout.