Join Date: Feb 2006
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You cannot be precise but you don't need to be exact - the rule is there as a guide so that dazzling fog lights are only on when desperately needed.
For a rough guide, consider a gap of about 4 or 5 buses in front of you. If you can't see further than that then you're definitely safe to put the fogs on.
Currently in moi's garage:
An Audi R8 in my dreams and Oily's Zafira