I think you meant "wound" up.It takes two to tango. Road Rage can only escalate into phyisical violence if both parties are sufficiently wond (sp) up.
I disagree however that it takes two to make road rage. I have a recent experience that supports my position. I think I am lucky the moron did not follow me all the way home. There's only so much you can do to ignore some doofus until you have to stop the car and get out at some point.