What is the meaning of the following traffic sign?

- No left turn.
- No U-turn to the left during night time only.
- A "u" turn at the nearest left turn is forbidden.· Correct answer
- No U-turn to the left and no left turn.

Sign 431 prohibits a U-turn to the left only, and does not prohibit an ordinary left turn. You must distinguish between the two types of turn.
A U-shaped arrow on the sign = U-turn, not an ordinary turn
Confusing a prohibition on U-turns with a prohibition on left turns
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