Correct answer
Yes, always.
Yes. Article 141.1 requires conspicuous-coloured clothing and retroreflective devices or elements for those regulating traffic, by day and night. The requirement is not confined to night-time. It helps users recognise them at a distance; it does not itself guarantee safety or allow their instructions to be ignored.
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All options
Yes, but only at night.
Yes, always.
No.
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