Which of the following sentences is correct: The law prohibit drivers from making a left U-turn:

1. When a U-turn prohibiting sign is placed.
2. Where the vehicle cannot be observed by other drivers approaching from any direction.
3. Correct answer: All the answers are correct.
4. When he approaches a steep peak or a curve in the road.

WhyYou may not make a U-turn where others cannot see you, before a hilltop or a dangerous bend, or where a prohibiting sign stands. All three options are correct.