The key to this is to shrink your emotional territory and think of alternative explanations for why someone behaves in a certain way. In other words, you find ways of excusing the person's behavior and not taking it personally. You've developed a 3-step program to help drivers overcome their negative feelings while driving. A is for Acknowledging. The first step in any personality change is to recognize that you need a change.
Most drivers claim they're good, competent, and safe.
This shows that they're in denial. So the first step is Acknowledging that you are an aggressive driver and that this is not a good thing. The second step, W, stands for Witnessing. I advise my students to carry a tape recorder in the car and to speak their thoughts out loud in traffic, then listen to it later. This is a shocking experience, revealing to yourself the real dimensions of your road rage.