I'm SO glad there are plenty of cycle tracks round where I live - I can cycle to Glasgow with less than a mile of it being done on the road.
People cycling on the pavement though still pisses me off, but at the same time, I can understand where they are coming from as I have in the past, had my handlebars clipped by a passsing van, nearly causing me to crash into the kerb which I was DIRECTLY beside (it was pretty hairly moment until I gained control again).
I was young and thought it was a mistake on the driver's part, but when I think about it now, it must have been deliberate as I was as far over to the left as I possibly could have been without being on the pavement!
To be honest, I have never had many problems on the roads around here and Glasgow, other than the occasional blip, but I might think twice about it if I was in the likes of London where everyone seems to be zarking insane!