What does a no U-turn sign signify?

The sign indicating "no U-turn" clearly communicates that making a U-turn at that particular location is not permitted. This restriction is typically implemented in areas where executing a U-turn could pose safety risks, such as high-traffic intersections, roads with limited visibility, or places where it might disrupt the flow of traffic. The intent behind this sign is to enhance safety by preventing potentially hazardous maneuvers that could lead to accidents or confusion among drivers.

The other choices suggest various conditions under which U-turns might be allowed, but they all misinterpret the clear directive of the no U-turn sign, which serves to prohibit the maneuver entirely in that area.