Does a no left turn sign also prohibit a u-turn true or false?

A no left turn sign does indeed prohibit a U-turn. This is because a U-turn involves movement from one direction to the opposite direction, which typically requires a left turn. When a no left turn sign is displayed, it indicates that drivers are not permitted to make a left turn at that intersection, and since performing a U-turn typically involves an initial left turn, the no left turn sign effectively prohibits that maneuver as well.

Additionally, the reasoning behind this is rooted in traffic safety and flow. Allowing U-turns where left turns are prohibited could create confusion and lead to unsafe driving conditions, as drivers would be attempting a maneuver that is not allowed in a busy or regulated intersection. Therefore, understanding signage and adhering to traffic regulations is crucial for maintaining safety on the roads.