[aidos]

I wonder if there's any weight to that assertion of a correlation between city size and aggression.

I live in London and I generally find that the behaviour is surprisingly courteous. My suspicion is that it's because many (most?) roads are actually too narrow to have two cars pass at the same time so people are very used to having to pull over to get out of each other's way.

Obviously, all totally anecdotal, but there must be some research on it.