What does the roundabout sign indicate to drivers?

The roundabout sign specifically warns drivers that they are approaching a traffic circle. This sign is essential for establishing that vehicles will need to yield to traffic already in the roundabout, ensuring a smooth flow and reducing the likelihood of collisions. As drivers approach the roundabout, they are informed to prepare for navigating through it, and they should be aware of other vehicles that might be entering or circulating within the roundabout.

Recognizing this sign helps drivers understand the specific traffic control measures required when entering a circular intersection, promoting safety and efficiency on the roads. The other options, while important in their own contexts, do not specifically pertain to the function or meaning conveyed by the roundabout sign.