Correct answer
Between sunset and sunrise, or in significantly reduced visibility, or in tunnels, underpasses and S-5 sections.
Between sunset and sunrise, in weather or environmental conditions significantly reducing visibility, and through tunnels, underpasses or S-5 signed sections, including by day. Article 99 requires position lights and, above 2.10 m width, outline marker lights. The requirement is not limited to night or excluded for trailers. Use other required lighting too.
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Only at night, never in a daytime tunnel.
Never, because trailers are exempt from outline marker lights.
Between sunset and sunrise, or in significantly reduced visibility, or in tunnels, underpasses and S-5 sections.
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