You're driving on a motorway in heavy rain. When are you allowed to use high-intensity rear fog lights? You're driving on a motorway in heavy rain. When are you allowed to use high-intensity rear fog lights?

• Possible answers:

   
• A. When visibility is more than 100 metres (328 feet)
• B. Only when the national speed limit applies
• C. Only when you're being followed closely by other traffic
• D. When visibility is reduced to 100 metres (328 feet) or less