My Kia 2014 Picanto uses the horn for the burglar alarm, and I'm parking in dodgy places.
I've only used my horn once every few months. The horn doesn't "toot" when the alarm is activated either.
I was thinking of getting a klaxon or "aa-oo-ga" horn so I could identify my car alarm.
Anyhow from my reading of NZTA rules, there's no maximum loudness, just that it can be heard from 100 meters, and some inapplicable rules around bells, whistle and sirens.
Is that correct?