Correct answer
Yes, the front fog light or the dipped or main beam.
Yes. When smoke significantly reduces visibility, lighting is compulsory even during the day. Article 106 permits front fog lights or dipped or main beam; front fog lights may be combined with dipped or main beam. The position lights required by Article 99 must also remain on. Do not use main beam if it dazzles others; reflection in smoke or fog can also worsen your own view, so dipped beam and, where appropriate, front fog lights are normally preferable. Rear fog lights are reserved for particularly adverse conditions such as dense smoke.
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No, except between sunset and sunrise.
Yes, the front fog light or the dipped or main beam.
Only when vehicles are approaching in the opposite direction.
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