Become a wise and safe OHV operator by getting to know the rules of the trail in Colorado. Read up on the laws, regulations and legislative statutes for operating off-highway vehicles in Colorado.
What You Need To Know about the Sound Law
(went into effect July 1, 2010)
To operate an Off Highway Vehicle (OHV) in Colorado, the following sound limits must be met:
99 dB(A) if manufactured before 1/1/1998
96 dB(A() if manufactured after 1/1/1998
OHVs will be tested using the SAE J 1287 stationary 20" pipe test.
New OHVs sold in Colorado cannot exceed the 96 dB(A) sound standard (unless an OHV is designed for and used in a closed-course competition facility).
OHVs designed for and used in closed-course competition facilities may require modifications for sound and spark arrestor standards when operated outside of a closed-circuit course.
Colorado State Parks, in conjunction with Stay The Trail, offer free sound testing for your OHV.
For a copy of the Stationary Sound Test Manual for Off-Highway Motorcycles and All-Terrain Vehicles (includes Test RPM data back to 1985) please call the Motorcycle Industry Council at 949-727-4211.