What is the meaning of a no left turn sign?

Answer: A — Left turns are restricted at that intersection

A no left turn sign indicates that left turns are prohibited at that specific intersection. This type of sign is typically placed to enhance traffic flow and improve safety by preventing potential collisions that may occur when vehicles are turning left across oncoming traffic. By designating that left turns are not allowed, the sign helps ensure that drivers follow an expected pattern of movement, thereby reducing confusion and minimizing accident risks. The other options address different traffic scenarios. For instance, one option regarding closed left turn lanes would apply when a lane is marked temporarily or permanently closed, which is not indicated by a no left turn sign. The suggestion that drivers must yield left does not align with the intent of a no left turn sign, as it does not pertain to yielding but rather outright prohibiting the turn. Lastly, indicating that left turns are preferred contradicts the core message of a no left turn sign, which clearly signals that such maneuvers are not permitted.