Which sign prohibits making a left turn and implicitly includes the prohibition of a U-turn as well?

Question

DentroTest · Accepted Answer

The correct answer is This is sign R-303 (No left turn). It is essential to remember the rule: the sign prohibiting a left turn also prohibits a U-turn. However, sign 1 (R-304, No U-turn) prohibits the U-turn but DOES allow a left turn. Option 3 corresponds to a mandatory direction sign.

Which sign prohibits making a left turn and implicitly includes the prohibition of a U-turn as well?

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