Correct answer
No, this specific prohibition does not apply to the bus.
No. R-306 prohibits lorries over 3,500 kg MAM from overtaking motor vehicles; it does not apply to the bus. The bus driver may only overtake if other rules and signs permit it and it is safe. The sign does not by itself limit the bus to the two right-hand lanes.
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All options
No, this specific prohibition does not apply to the bus.
Yes, it prohibits all vehicles from overtaking.
Yes, but only if it uses the third lane.
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Sign R-306: no overtaking for lorries
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