Best fog light

Personally I would get some really bright LED driving lights but I would wire them into a switch as well as through the high beams so that they will automatically shut off whenever you dim the lights. One less switch to worry about when meeting oncoming traffic.

 

Only problem with that is most people run with their lights on dim in the fog as it helps you see the road better. On bright in fog everything just turns white.

 

Most drivers don't have sense enough to shut them off in any language