Correct answer
At night or when weather or environmental conditions require it.
During night-time hours or when weather or environmental conditions require it, under article 148. Roadworks affecting traffic must be signposted both day and night. Illuminated marking is not exclusively night-time: it may also be required by daytime conditions. It is not invariably required throughout every day merely because roadworks exist.
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Only at night, even when daytime conditions also require it.
At night or when weather or environmental conditions require it.
Only by day and never at night.
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