Road Rage seems to me to be a symptom of drivers' inability to communicate with each other. All you have are your lights and your horn. The usual methods for defusing conflicts are impossible - when in a car, you can't make requests of, apologize to, or even say "thank you" to another driver. There's no room for politeness in the system, and the lack of standard social feedback makes people feel like others are treating them with contempt, which in turn makes them angry.

I don't know what the customs are where you are, but in the U.K., one politely waves to a driver who has politely let one through, to acknowledge their politeness.