2016 RAM Super Ike Gauntlet

SoCalDesertRider wrote:
The loudness limit is probably 120 or 150 deciBels. We have no laws regarding air horns specifically. My International has air horns from the factory, as do most large commercial trucks.

I believe the DOT vehicle noise limit is about 95 decibels. Also, you should have two horns on your truck, an electric horn just like every other vehicle and your air horn. Your electric or "city" horn as it is called in the industry is used for on road while your air horn is for off road use. Commercial trucks are allowed to have these horns to be used in noisy non-highway work environments. I work in the class 7 & 8 industry as well, but I work on the manufacturer and dealership side. And yes, one of our OE's is International and Peterbilt.