Correct answer
No, but full beam may reflect off rain or fog and worsen vision.
Those conditions alone do not prohibit it: article 106 of the General Traffic Regulations provides for dipped or full beam and front fog lighting when visibility is significantly reduced. However, full beam may reflect off rain or fog and worsen vision, so use dipped beam when more suitable. Switch to dipped beam if full beam may dazzle other road users, under article 102. Rear fog lights are used only when conditions are especially adverse.
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No, but full beam may reflect off rain or fog and worsen vision.
Yes, it is always prohibited even if nobody is dazzled.
No, and full beam always improves vision in thick fog.
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