I am losing my temper less of late, maybe I've just realised it doesn't matter in the grand scheme of things? Or maybe I've realised they were fairly trivial incidents to start with. If I had a major clash with a motorist I would probably still see red and end up screaming obscenities, lets hope it never happens.
I think it helps to tell somebody about your incidents though, that way they are put to bed and out of your head so you don't dwell on them so much.
I also like to have an imaginary conversation with the police when I report the incident, then by the time I get home I don't feel I need to actually ring it in.