As you may have read in the AM news roundup, doctors have defined the mental disorder for road rage: It's called Intermittent Explosive Disorder.
According to an AP story:
By definition, intermittent explosive disorder involves multiple outbursts that are way out of proportion to the situation. These angry outbursts often include threats or aggressive actions and property damage. The disorder typically first appears in adolescence; in the study, the average age of onset was 14.
Sounds serious, doesn' t it? But no matter what you call a spade, it's still a spade. And we'd like to call that guy who gave us the single finger salute last week on the 405, just a good-old fashioned asshole.