I just read this at this website.
Of course, I wouldn't have found it half as fascinating if I weren't one of the least likely to be in an accident. Perhaps all of that Leo venting and boiling over at minor things pays off on the road, because then we can afford to be charitable and patient, while other, more outwardly patient signs, bottle things up all the live-long day, and let it all explode while they're in motor vehicles?
I don't know, that's just a theory. But a good one!