I stand corrected and that rule has obviously changed since I last read the highway code (I wish they would publicise stuff like that).
Doesn't change my original point about d**ks using them in all conditions - and doesn't alter the fact that they blind in rain.... and visibility below 100m is some pretty serious heavy rain, the sort we hardly ever see in this country.
Ever been to wales - the lakes - scotland?
Very often get rain with less than 100m visability.
Although I do agree too many people use fog's when it isn't needed