If a traffic sign shows a red circle with a line through it, what does it indicate?

A traffic sign featuring a red circle with a line through it is universally recognized as a prohibition symbol. This type of sign communicates that a certain action or behavior is not allowed. For example, if the sign indicates "No U-Turns," it clearly tells drivers that making a U-turn in that area is against the rules. The striking red color denotes urgency and danger, reinforcing that adherence to the sign is important for safety and compliance with traffic regulations.

The meanings associated with other signs, such as encouraging actions or making them optional, do not apply here, as this sign specifically serves to indicate restrictions. The intent behind such a sign is to enhance safety on the roads by preventing potentially hazardous actions that could result in accidents or disruption of traffic flow.