I cruised through the whole thread and noted something that was left unsaid. If you find yourself in a road rage situation, don't drive faster. Slow down and if necessary, pull over. Nothing will be gained by turning a road rage incident into a high speed road rage incident! If you have your cell phone, call the law.
Flash
Pulling over can lead to the other person blocking you in and coming after you. Better make sure you are prepared to drive off, perhaps over the assailant, if you pull over and stop.