What does a red circle with a slash through it indicate?

A red circle with a slash through it is a common traffic sign that indicates an action is prohibited. This symbol signals to drivers that a specific behavior or action, such as making a U-turn, parking, or entering a certain area, is not allowed. It serves as a clear and universally recognized warning to enhance safety and order on the road, helping to reduce confusion and ensure that all drivers are aware of the restrictions in place. The use of this sign is consistent across various jurisdictions, reinforcing its meaning and importance in traffic management.