Is it illegal to use an air horn?

While owning and installing an aftermarket air horn or train horn is not illegal, some states have periodic inspections that your vehicle has to pass. For some of these inspections, having a train horn hooked up to your ride or, in some cases, having it wired up to be your only horn will cause you to fail inspection.



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In some research, it was proven that a 90 decibel sound can cause deafness. However, it was also proven that a 90-decibel noise can only cause said injury if the person is constantly exposed to the sound. Thus, laws were enacted to abate this noise in order to avoid causing injuries to the public.

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Air Capacity The amount of air stored in the air tank will determine how long you can hold the horn blast before the tank has to refill. For reference, a 1 gallon air tank filled to 150 PSI will give you about a 4-5 second blast before the compressor will turn on to refill the tank.

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