What is the purpose of a ‘No U-Turn’ sign?

Answer: A — To indicate that U-turns are prohibited at that location

A ‘No U-Turn’ sign serves the specific purpose of informing drivers that making a U-turn at that location is prohibited. This prohibition is typically in place to enhance safety and traffic flow, as U-turns can create hazards for other vehicles and pedestrians, especially in areas with high traffic volume or limited visibility. By clearly marking these areas, the sign helps to prevent accidents and maintains orderly driving practices. The other choices suggest alternative functions for a U-turn sign, which do not align with the standard understanding of traffic signage. For instance, allowing U-turns only during certain hours would create confusion and complicate the driving rules at that location. Similarly, indicating the best place to make a U-turn would contradict the intention of preventing them, and recommending alternative routes for U-turns implies a different kind of directional guidance, which is not the purpose of the 'No U-Turn' sign. Thus, the chosen answer accurately reflects the primary role of the sign in traffic regulation.