Which traffic control device is most commonly associated with roundabouts?

Answer: A — A yield sign

The main idea is how entering drivers interact with traffic already in the circle. Roundabouts are designed so that vehicles entering yield to those already circulating. The sign that communicates this rule at each entrance is the yield sign. It tells drivers to slow down, check for gaps in the circulating traffic, and enter only when it’s safe, which keeps traffic flowing smoothly without unnecessary stops. A stop sign would require a full stop even when traffic is clear, which disrupts flow. A speed limit sign controls speed but doesn’t govern who enters first. A do not enter sign would block access, which isn’t how roundabouts are designed to operate.