A horn, when heard as a pedestrian, is extremely loud, but it's not that loud to the driver using the horn, or to other drivers, since they are shielded by thei

A horn, when heard as a pedestrian, is extremely loud, but it's not that loud to the driver using the horn, or to other drivers, since they are shielded by their vehicles. If the horn were as loud inside the vehicle (or close to it) as it is outside of the vehicle, then drivers might be dissuaded from using the horn frivolously. A regulation could be enacted that mandates that the horn's volume inside the car be closer to the volume of the horn when heard outside of the car.