Making U-turns is not legal in which of the following areas?

Making U-turns is not legal near the crest of a hill or in a curve due to safety considerations. These locations often have limited visibility, making it difficult for other drivers to see a vehicle executing a U-turn. This increases the risk of collisions, as other vehicles may not be able to react in time if they are approaching the area at speed or if their line of sight is obstructed by the hill or curve. For this reason, it is prohibited to perform a U-turn in such areas to ensure the safety of all road users.

While U-turns may be restricted near other locations, they are particularly hazardous when done in places where visibility is compromised, thus justifying the specific prohibition in these scenarios.