Final answer:
U-turns and turnabouts on hills or curves are generally not recommended due to safety hazards and limited visibility.
Step-by-step explanation:
When it comes to doing a U-turn or turnabout, it is generally not recommended to do so on a hill or curve.
This is because hills and curves can pose safety hazards and increase the risk of accidents. U-turns and turnabouts require a larger turning radius, which can be difficult to execute on a curve or hill with limited visibility. It is best to find a straight and flat section of the road to perform a U-turn or turnabout.