Correct answer
When fog, heavy rain or snowfall substantially reduces visibility.
When conditions such as fog, heavy rain or snowfall substantially reduce visibility. Front fog lights are not invariably mandatory: Article 106 permits statutory lighting alternatives. They may also be used on narrow roads up to 6.50 m wide signed for successive bends. A tunnel or additional lane does not itself require them.
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Always in any tunnel even without conditions permitting their use.
When fog, heavy rain or snowfall substantially reduces visibility.
Always in any additional lane even without conditions permitting their use.
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