What does a sign that says "No Left Turn" indicate?

A sign that states "No Left Turn" clearly indicates that making a left turn at that specific intersection is prohibited. This rule is put in place to enhance safety and traffic flow, typically in areas where a left turn could create hazards or congestion.

Such signs often appear in busy intersections or areas with high pedestrian traffic, where turning left might impede the movement of vehicles or increase the risk of accidents. By directing drivers to avoid a left turn, the sign helps maintain a more orderly flow of traffic and reduces the likelihood of collisions.

Other options do not correctly represent the intention of the "No Left Turn" sign. Indicating that left turns are allowed contradicts the purpose of the sign, while suggesting a detour or specific hours for turning left misinterprets the regulation and may confuse drivers about when or how they can make a left turn.