Colorado Code § 25-12-107

Powers of local authorities
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(1) Counties or municipalities may adopt
resolutions or ordinances prohibiting the operation of motor vehicles within their respective
jurisdictions that produce noise in excess of the sound levels in decibels, measured on the "A"
scale on a standard sound level meter having characteristics established by the American
national standards institute, publication S1.4 - 1971, and measured at a distance of fifty feet from
the center of the lane of travel and within the speed limits specified in this section:
Speed limit
of more
Speed limit than 35 mph
of 35 mph but less
or less than 55 mph
(a) Any motor vehicle with a manufacturer's
gross vehicle weight rating of six thousand
pounds or more, any combination of vehicles
towed by such motor vehicle, and any
motorcycle other than a low-power scooter:
(I) Before January 1, 1973 88 db(A) 90 db(A)
(II) On and after January 1, 1973 86 db(A) 90 db(A)
(b) (Deleted by amendment, L. 2008, p. 2102, § 3, effective July 1, 2010.) 
(2) The governing board shall adopt resolutions establishing any test procedures deemed
necessary.
(3) This section applies to the total noise from a vehicle or combination of vehicles.
(4) For the purpose of this section, a truck, truck tractor, or bus that is not equipped with
an identification plate or marking bearing the manufacturer's name and manufacturer's gross
vehicle weight rating shall be considered as having a manufacturer's gross vehicle weight rating
of six thousand pounds or more if the unladen weight is more than five thousand pounds.

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