What is the purpose of a "no turn on red" sign?

The purpose of a "no turn on red" sign is primarily to prevent accidents. When traffic is approaching an intersection where a turn on red is prohibited, it ensures that vehicles must come to a complete stop and yield to any oncoming traffic or pedestrians before proceeding. This rule is particularly important in situations where visibility might be limited, or where there is a high volume of pedestrian traffic, as it helps to prevent collisions that could occur if drivers were allowed to turn left or right on red without waiting for a clear and safe opportunity.

While the other options may touch on aspects related to traffic management and safety, the main focus of a "no turn on red" sign is indeed to enhance safety by reducing the potential for accidents at intersections.