Also I’ve noticed, at least in Australia. Bus horns are quieter than truck horns.
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It’s already been explained that they operate on compressed air, but to add to that, it’s kind of a safety thing. A commercial truck that needs to blow that horn, also needs to make sure it’s heard. The little “beep beep” you get from a standard car horn doesn’t cut it when you need to warn somebody that may be blasting their radio that they just did (or are about to do) something stupid around a tractor trailer and that they might be about to die if they don’t un-stupid it.
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