Final answer:
A sign with a red slash through a U-turn symbol indicates that U-turns are not permitted; it's a traffic sign designed to improve safety at intersections and other road segments where U-turns can be dangerous.
Step-by-step explanation:
The sign that indicates U-turns are not permitted is typically a circular sign with a red slash through a U-turn symbol. In places where U-turns are not allowed, traffic authorities place a sign showing a U-turn pictogram with a red circle and a diagonal red line over it, which universally means that the action depicted is not allowed. This traffic sign is an important safety measure especially at intersections where making a U-turn could pose a hazard due to oncoming traffic or high-speed vehicles that do not expect a car to turn in front of them.
The sign that indicates that U-turns are not permitted is a circular sign with a red border and a red slash across a black arrow that is pointing left. This sign is often seen on roads where U-turns are prohibited for safety reasons, such as on highways, busy intersections, and roads with limited visibility. It is important for drivers to obey these signs to prevent accidents and maintain smooth traffic flow.