You're driving in fog. When should high-intensity rear fog lights be used? You're driving in fog. When should high-intensity rear fog lights be used?

• Possible answers:

   
• A. When visibility falls below 100 metres (328 feet)
• B. When visibility falls below 200 metres (656 feet)
• C. When visibility falls below 300 metres (984 feet)
• D. When visibility falls below 400 metres (1312 feet)