What is the primary purpose of a roundabout?

Answer: B — To reduce the number and severity of collisions and improve traffic flow

The primary purpose of a roundabout is to reduce the number and severity of collisions and improve traffic flow. Roundabouts are designed to keep traffic moving while decreasing the likelihood of severe accidents, which often occur at traditional intersections where vehicles may face head-on or T-bone collisions. By guiding vehicles in a circular motion, roundabouts minimize the chances of high-speed collisions. They enable drivers to enter and exit the roundabout at lower speeds and reduce the need for traffic signals or stop signs, which can cause vehicles to come to a complete stop and create a higher potential for rear-end collisions. Additionally, roundabouts promote a continuous flow of traffic, helping to alleviate congestion and reduce travel times. The other options do not accurately reflect the primary function of a roundabout. For instance, while roundabouts can reduce the need for traffic signals, they are not designed to eliminate all traffic signals. Increasing vehicle speed is not a goal of roundabouts, as they prioritize safety and flow over speed. Lastly, roundabouts do not typically create additional parking spaces; their design is focused on managing traffic and enhancing safety instead.