There is a lot of aggressive driving around overwhelmingly by young people. But then I guess that as a testosterone fuelled 18 year old, I was probably fairly aggressive on the road. Add into the equation commercial drivers under time/bonus pressure and white vans which have car like performance and speed.
That said by far the worse time is the weekend and I can only put that down to the kiddies who have saved up petrol money to chow off the Clio to their mates at the weekend.