Install a second horn in cars
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Install a second horn in cars. The original horn would be used for hazard warnings or to communicate anger or outrage. This would have a typically harsh sound. The second horn would be for thanking people, or saying goodbye when pulling away from friends. This horn would have a happier, more comic tone and be accordingly visually represented on the dashboard. A few road rage incidents may be avoided if drivers could differentiate more clearly between annoyance and gratefulness. A range of happy horn sounds could be offered by manufacturers.