Back when I was younger I did my fair share of biking, riding anything from a Honda 90 to a Norbsa (Norton featherbed frame with a BSA 650cc engine. I was never involved in an accident which seems fortunate when you watch this video. I put a lot of these down to inattentive drivers but also speeding by the bikers is a contributing factor.
http://www.youtube.com/watch?feature=endscreen&v=5aoT1Nwo7UI&NR=1