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Read rule 226

Adverse weather: rules 226–237

Review how wet roads, ice, snow, wind, fog and heat affect visibility, grip and safe driving decisions.

Rule 226

You MUST use headlights when visibility is seriously reduced, generally when you cannot see for more than 100 metres (328 feet). You may also use front or rear fog lights but you MUST switch them off when visibility improves (see Rule 236 ). Law RVLR regs 25 & 27

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