What is the meaning of the following traffic signs?

- No left turn for public vehicles only.
- No left or U-turn.
- No left U-turn only.
- A turn at the nearest left or nearest right turn is not permitted.· Correct answer

The red signs with the diagonal stroke indicate a prohibition on turning. When the stroke is over a left arrow, turning left is prohibited, when it is over a right arrow, turning right is prohibited.
Arrow with a red diagonal stroke = turning in the arrow's direction is prohibited.
Thinking it is only a prohibition on U-turns.
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