I am on my second Japanese car. Both of them have terrible polite horns. They give a polite, fairly high pitched, meep sort of noise. It is as though the cars, like the Japanese, are brought up to be very polite and self effacing. They don't say get out of my way, they say, excuse me please, may I trouble you to let me past? The various Renault cars have a hearty, loud, and very French parp noise, as if to say - gangway, I am coming through!.
I would need to do some research into this but I am beginning to think that there is a profound sociological study in the waiting here. Car horns as indicators of national character.