Also I’ve noticed, at least in Australia. Bus horns are quieter than truck horns.
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Trucks, specially tractor trucks (the ones with detachable trailers), use compressed air to keep the brakes off. This means they default to on (parking/handbrake) when they’re detached.
This means its very easy to make a compressed air horn, and in the case of the road trains, potentially even have extras if necessary. Where normal horns are just an electric speaker, pushed to it’s max, which aren’t very loud by comparison. They require a lot of power to make them loud, which most car/truck electrical systems aren’t, they’re relatively low voltage compared to say a concert tier sound system, which is probably what you’d need to make a comparably loud sound.
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