- The noise level of Harley Davidson motorcycle horns ranges from 100 to 130 decibels. - The loud sound is intended to alert other motorists of your presence on the road. - It is important to comply with local noise regulations to avoid legal consequences.

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Keep in mind that zero db is complete silence, while 135 is mid-level painful. Consider that your average leaf blower produces around 70-75 db at a 50-foot distance, enough such that the operator has to wear hearing protectors. Unmuffled Harley engines can put out around 120 db.