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I think that's the more minor part of the noise that the original comment was referring to. It's much easier to insulate one's detached house from suburban noise than it is to insulate one's apartment from noisy neighbors on the other side of a shared wall. It's also my experience that those noisy neighbors are a much bigger nuisance than the traffic noise in the first place.

On a tangential note, I'd be curious to know whether you have any links to back up the claim that urban environments are often less noisy. I don't disbelieve the claim outright, but it sure doesn't match my personal experience.