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

The purpose of a "No U-Turn" sign is to indicate that making a U-turn at that particular location is illegal. This regulation is typically in place for safety reasons, as U-turns can be hazardous to both the driver making the turn and other road users. The sign helps maintain traffic flow and reduces the risk of accidents by clearly advising drivers not to execute a U-turn in the area where the sign is posted.

In general, such restrictions may exist in areas where visibility is limited, where it may obstruct other vehicles, or near intersections where traffic is heavy. The presence of this sign is a straightforward instruction for road users, emphasizing compliance with traffic laws and ensuring safer driving conditions. Other choices imply varying degrees of permissiveness regarding U-turns, which contradicts the direct legal prohibition represented by the "No U-Turn" sign.