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Because it was the law when cars first came out.
Historically, when cars started appearing, the roads were dominated by horses and horse-drawn carriages. Horse-related transport had the right of way on the road. The law stated that if you were coming around a blind corner or large bend, you had to honk the horn so the driver/rider of the horse knew a car was around the corner.
That is why cars have horns in the first place.
When horses were phased out of the transport system and cars became the everyday norm, there, at first, wasn't any real reason to keep the horns, so there was a discussion to have them removed from future cars. However, we decided to keep the horns rather than getting rid of them, because they can be useful in modern society too.
These days, we use car horns to:
- Alert other cars when you're coming around a blind corner
- Alert pedestrians who are not concentrating on where they're walking
- Alert other drivers when they are about to make a driving fault so they can avoid hitting you
And that's about it. The purpose of the horn in modern society is to alert people for safety reasons. Using the horn for other reasons (ie, to annoy on purpose or in a road rage) is actually a criminal offence in most countries (because you're not concentrating).
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