For one thing, aggression can result in an extreme response from others. It causes you to go to extremes in your own driving. Courtesy is like swing dancing. It's important not to step on people's toes. It's a short trip from anger to rage.
Aggressive drivers do the kinds of things that other drivers respond to with anger.
At the extreme, anger turns to Road Rage and knows no limits. In the grip of road rage, drivers blame their actions on others. They believe they can be provoked by others and frequently express their feelings by pursuing revenge. This anger can also spread from one driver to another so that both drivers get caught up in a crazy and dangerous revenge contest. Rank the list below from one to ten - from most upsetting to least.