What action is prohibited by a sign featuring a red circle and diagonal slash?

A sign with a red circle and diagonal slash universally indicates that a specific action is prohibited. This is a standard convention used in traffic signage to convey restrictions clearly and efficiently. In this case, the correct interpretation is that the sign prohibits making a U-turn.

Making a U-turn is often restricted in certain areas to improve safety, reduce traffic congestion, or because of local regulations. The visual cue of the red circle and diagonal slash effectively communicates that drivers should not perform this maneuver.

Although other actions such as turning left, parking, or stopping may also have specific signs indicating their prohibition, the U-turn prohibition is distinctively represented in this format. Understanding the meaning behind the red circle and slash is crucial for drivers to navigate safely and adhere to traffic laws.