Correct answer
Yes, taking care not to dazzle other road users.
Yes, provided other road users are not dazzled. Article 106 permits dipped or full beam in the reduced-visibility conditions described, but article 102’s duty to avoid dazzling still applies. In fog, full beam can reflect back and worsen your own view; use dipped beam and fog lights when appropriate. Do not attempt to adjust headlight alignment while driving to keep full beam on. Reduce speed and adapt separation to what you can actually see.
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Yes, taking care not to dazzle other road users.
No, it is prohibited.
Only on roads with one lane in each direction.
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