Keep your head moving when you are driving or riding - or disaster can sneak up on you!
Motion induced blindness makes you miss things outside where you are focusing, if you keep your gaze on one spot or in one direction for too long - see this demonstration.
I personally have had things appear out of nowhere, even after looking both ways on a supposedly clear road. Check twice - the life you save may be your own!
MSF is a good overall site for rider safety.Check them out!