§ 257-707a

257.707a Definitions used in MCL 257.707a to 257.707e. Sec. 707a. As used in sections 707a to 707e: (a) 'Decibel' means a unit of sound level on a logarithmic scale measured relative to the threshold of audible sound by the human ear, in compliance with American national standards institute standard S 1.1-1960. (b) 'Decibels on the a-weighted network' or 'DBA' means decibels measured on the a-weighted network of a sound level meter, as specified in American national standards institute standard S 1.4-1971. (c) 'Fast meter response' means the meter ballistics of meter dynamic characteristics as specified by American national standard S 1.4-1971. (d) 'Maximum noise' means the noise emitted from a vehicle during that manner of operation which causes the highest DBA level possible from that vehicle. (e) 'Muffler' means a device for abating the sound of escaping gases of an internal combustion engine. (f) 'Exhaust system' means the system comprised of a combination of components which provides for enclosed flow of exhaust gas from engine parts to the atmosphere. (g) 'Noise' means any sound.

ngine. (f) 'Exhaust system' means the system comprised of a combination of components which provides for enclosed flow of exhaust gas from engine parts to the atmosphere. (g) 'Noise' means any sound. (h) 'Total noise' means noises radiating from a vehicle but does not include noises emitted from a horn, siren, bell or other similar device of an authorized emergency vehicle. (i) 'Gross vehicle weight rating' means the value specified by the manufacturer as the loaded weight of a vehicle. (j) 'Combination vehicle' means any combination of truck, truck tractor, trailer, semi-trailer or pole trailer used upon the highways or streets in the transportation of passengers or property. History: Add. 1978, Act 73, Imd. Eff. Mar. 21, 1978 ;-- Am. 1978, Act 492, Imd. Eff. Dec. 1, 1978