Correct answer
Retroreflective materials or devices complying with technical rules.
Retroreflective materials or devices complying with applicable technical rules. This requirement does not mean every warning or regulatory sign must have its own lighting. Signs must also be interpreted at night, and visibility is not exclusively a matter of traffic lights.
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No elements; road signs only need to be visible by day.
Retroreflective materials or devices complying with technical rules.
Only a traffic light, because all other signs have no visibility requirements.
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