....its mainly a combination of poor visibility & piss poor driving....
it was in the morning rush hour....7.15am....peak time for idiots checking their email, facebook & twitter feeds whist driving....I see it all the time.
I used to drive around 40,000 miles per year......so glad I don't do it these days.....far too many gormless twats behind the wheel playing with technology instead of concentrating on driving safely.