Originally Posted by foghelmut
"in conditions of extremely poor visibility due to snow, fog or heavy rain, good fog lamps light the foreground and the road edges only, so you can see your way safely at reduced speeds."
I'm not sure what you expect from fog lights. They are not an additional set of headlights.
Seriously. When it's hard to see the lane markers in a snowstorm, turn on the foglights to help. It's pretty much that simple.