What does a 'No U-turn' sign indicate?

Answer: B — U-turns are prohibited at this location

The 'No U-turn' sign clearly communicates that making a U-turn at that specific location is not permitted. This restriction is typically enforced due to safety concerns, traffic flow issues, or the design of the roadway. By prohibiting U-turns, the sign helps reduce the risk of accidents that could occur if drivers were to turn their vehicles around in areas where visibility is limited or where road conditions would make such maneuvers hazardous. Other options suggest varying degrees of allowance for U-turns, which contradict the definitive nature of the 'No U-turn' sign. The sign specifically serves to prevent any U-turns, ensuring both drivers and pedestrians can navigate the area without confusion or danger.