What does a 'no U-turn' sign signify?

A 'no U-turn' sign indicates that making a U-turn is prohibited in that specific area. This restriction is usually implemented in locations where turning around may cause hazards, such as near intersections, on busy roads, or in areas where visibility is limited. The sign is meant to enhance traffic safety by preventing maneuvers that could lead to collisions or disrupt the flow of traffic.

In contrast, the other options do not accurately reflect the meaning of the sign. Making a U-turn being allowed contradicts the purpose of the prohibition. Additionally, requiring drivers to turn right or left does not align with the sign's intent, as the focus is solely on the U-turn maneuver. The 'no U-turn' sign serves as a clear directive for drivers to adhere to the traffic regulations in place for their safety and the safety of others on the road.