What is the meaning of a no left turn sign?

A no left turn sign clearly indicates that left turns are prohibited at that intersection. This type of sign is essential for maintaining traffic flow and ensuring safety, especially at busy intersections where a left turn may interfere with oncoming traffic or create hazards for pedestrians. When approaching such a sign, drivers need to adhere strictly to the prohibition, as attempting to make a left turn can lead to traffic violations and potentially dangerous situations.

Other options suggest that left turns may be allowed either conditionally or outright, which contradicts the clear directive given by a no left turn sign. Understanding these signs is vital for safe navigation in road environments.