Signs with a white background and a red circle with a diagonal line through it indicate what?

Signs featuring a white background with a red circle and a diagonal line through it serve to indicate regulations that prohibit certain actions. This signage communicates that a specific activity or maneuver is not allowed, helping to maintain safety and order on the roads. For example, such signs might indicate restrictions like "No U-Turn" or "No Parking," making it clear to drivers what actions are prohibited in that area.

The design—specifically the red circle and diagonal line—visually conveys an immediate understanding of the restriction, alerting drivers to adjust their behavior accordingly. This is crucial for ensuring that road laws are followed, preventing accidents, and ensuring smooth traffic flow.