What is the purpose of a roundabout?

The purpose of a roundabout is to facilitate the flow of traffic and reduce accidents. Roundabouts are designed to keep vehicles moving smoothly and safely by allowing continuous circulation around a central island. This design minimizes points of conflict, as vehicles merge instead of coming to a complete stop, which decreases the likelihood of high-speed collisions. The circular layout directs traffic in a single direction, which further enhances safety by reducing the chances of head-on and right-angle crashes, common at traditional intersections. Additionally, the reduced need for traffic signals often leads to lower delays, improving overall traffic efficiency.

In contrast, the other options don't accurately represent the fundamental role of roundabouts. While speed limits can affect how cars navigate a roundabout, they are not the primary purpose. Roundabouts are not specifically designed to give pedestrians more space or to create designated parking areas, as those elements are typically addressed through separate roadway designs and urban planning strategies.