Under which conditions is it permitted to make a U-turn?

1. Making a U-turn is only allowed in a roadway that has at least three lanes.
2. It is permitted everywhere, but the turn must be made without any maneuvering.
3. Correct answer: When no traffic disturbance is caused and no passerby is at risk, provided that there is no road sign that prohibits making a U-turn.
4. A U-turn is permitted in an intersection only.

WhyA U-turn is allowed if you don't disturb or endanger anyone and no sign prohibits it. A junction or number of lanes isn't a condition.