What is the primary purpose of a roundabout?

• A. To speed traffic through intersections.
• B. To move traffic smoothly with reduced speeds; yield to vehicles already in the circle and enter when safe.
• C. To eliminate all pedestrian crossings.
• D. To require drivers to stop before entering.

Answer: (B)

Roundabouts are designed to keep traffic moving smoothly by reducing speeds at intersections and by limiting the types of crashes that can happen. The way they operate—yield to vehicles already in the circle and enter when it’s safe—lets cars circulate with a controlled, continuous flow rather than stopping and starting. As you approach, slow down and look for gaps, enter when safe, travel around the central island at a reduced speed, and exit when you’ve reached your intended road, signaling as you leave. Pedestrian crossings are still provided at designated points, not eliminated. So the primary purpose is to move traffic smoothly with reduced speeds and a simple yield-on-entry rule, which is why this option is the best choice.