Interesting to me is when I am in traffic and I think "That guy wants to cut me off" or "This guy wants to get the jump on me when the light turns green". Sometimes I can point to a behavior and say 'there's the tip-off', but often as not I just get a feel that they're driving aggressively. The automotive body language is (perhaps) emitted and read unconsciously.
Some info about that would have been interesting.
Ya, me too. The usual tip off for me is that they are driving a Nissan Maxima or Ultima. I don't know what it is about these two cars that turn normal law-abiding people into road-rage inducing jerks.