When can you legally make a U-turn?

The ability to legally make a U-turn is primarily governed by two main factors: safety and local regulations. When it is deemed safe to perform the maneuver without endangering yourself or others, and if there are no signs explicitly prohibiting U-turns, it is permissible to execute this turn.

Considerations such as visibility, the volume of traffic, and the conditions of the road play significant roles in determining safety. U-turns can typically be made at intersections or other wide enough spaces unless specific signs indicate otherwise.

The other options don't encapsulate these critical factors. Making a U-turn at just any intersection may not always be safe or legal, as some may have restrictions or poor visibility. Functioning solely in areas designated for U-turns ignores the broader context of safety as the primary requirement. While minimal traffic might make a U-turn easier, it alone does not justify the legality of the action without considering safety and sign regulations.