Final answer:
A legal U-turn can generally be made on a divided highway where an opening is provided for turning. It is usually illegal to make U-turns across double yellow lines or in front of a fire station.
Step-by-step explanation:
The question relates to traffic laws and when it is legal to make a U-turn. According to most traffic regulations, you can make a legal U-turn:
Making a U-turn across two sets of double yellow lines is generally illegal because these lines indicate a barrier that should not be crossed. Similarly, it is usually not allowed to make a U-turn in front of a fire station due to the potential hazard it poses to emergency response vehicles. However, on a divided highway where an opening is specifically provided for turning, a U-turn can be legally executed assuming no other regulations or signs prohibit such a maneuver. Always check and follow local traffic laws and regulations, as they can vary by location.