now theyre saying that people with road rage suffer from IAD - Intermittent Anger Disorder (also sometimes called Intermittent Explosive Disorder).
So now there's an official disorder for those angry outbursts. *shaking head*
edit - some googling shows that it's not totally new, that IED was added to the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders in 1980. Still, though, first i've heard about an official term/diagnosis for people with anger issues.