Correct answer
Yes, always, regardless of their MAM.
Yes, whether its maximum authorised mass is below or above 3,500 kg. The requirement concerns direction-indicator equipment with hazard-warning signalling, not keeping the lights continuously switched on. Agricultural trailers have their own provisions and are excluded from the question. Check operation and connections before travelling; 3,500 kg is not the threshold for this requirement.
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All options
Yes, always, regardless of their MAM.
It isn't compulsory, but they may carry it.
Yes, when they exceed 3,500 kg MAM.
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