Controlling tempers and leaving earlier are two ways to help to stop road rage in yourself. You just need to leave in plenty of time to get to where you are going. And don't let other people bother you. As I've gotten older, I've gotten more cautious. I drive as though the person next to me is slightly crazy.
Alternative routes can also avoid unpleasant or more hectic situations.
I believe that for most people, stress is self-inflicted. Don't let the rudeness of the other driver affect you. They have the problem, don't let it become your problem. If you have an appointment allow plenty of time. Except for the rare life threatening event, nothing is as important as it first seems.