Iowa Admin. Code r. 571-46.12
No person shall operate an all-terrain vehicle or off-road motorcycle that is constructed or altered in a manner that noise emitted from the all-terrain vehicle or off-road motorcycle exceeds 96 decibels on the A scale when measured in the manner prescribed in the revised 2017-04, Society of Automotive Engineers Standard J1287, titled “Measurement of Exhaust Sound Pressure Levels of Stationary Motorcycles.”
[ARC 9221C, IAB 5/14/25, effective 6/18/25]