What is the significance of a no U-turn sign?

Answer: B — U-turns are not allowed at that intersection

A no U-turn sign indicates that making a U-turn at that specific intersection is prohibited. The primary purpose of this sign is to enhance safety and maintain smooth traffic flow. This restriction often applies to areas where visibility is limited, traffic is heavy, or where U-turns could lead to accidents. By communicating this regulation clearly to drivers, the sign helps prevent confusion and reduce potential hazards associated with sudden movements across lanes of traffic. It is an important part of traffic control that contributes to the overall effectiveness of road safety measures.