I did a defensive driving training course for work recently and it's surprising the number of little things you can pick up, despite driving for over 25 years and riding for over 30... :-?
The instructor on the day said that most collisions between vehicles happen at junctions (stating the obvious a bit there), and most of those are tail-gates, usually dozy eejits not paying attention and unable to stop in time > A really useful tip he gave was that when stopped, even if the handbrake is on, leave your foot on the brake so that the brake lights are illuminated - that way it makes your stationary presence a little more obvious to the eejit approcahing from behind who's texting/phoning/tuning the radio/talking to the kids/picking his or her nose... a good tip [smiley=thumbsup.gif]
The instructor also said that bikers do tend to be far more alert to their surroundings when in a car (well, some of us I suppose, reading this... )