{"data":{"id":"us-mi/mich.-comp.-laws-257.707a","jurisdiction":"us-mi","citation":"Mich. Comp. Laws § 257.707a","heading":"Definitions used in MCL 257.707a to 257.707e.","body":"Sec. 707a.\n\nAs used in sections 707a to 707e:\n\n\"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.\n\n\"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.\n\n\"Fast meter response\" means the meter ballistics of meter dynamic characteristics as specified by American national standard S 1.4-1971.\n\n\"Maximum noise\" means the noise emitted from a vehicle during that manner of operation which causes the highest DBA level possible from that vehicle.\n\n\"Muffler\" means a device for abating the sound of escaping gases of an internal combustion engine.\n\n\"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.\n\n\"Noise\" means any sound.\n\n\"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.\n\n\"Gross vehicle weight rating\" means the value specified by the manufacturer as the loaded weight of a vehicle.\n\n\"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.","path":["MI Code","Chapter 257","Act Act-300-of-1949"],"source_url":"https://www.legislature.mi.gov/Laws/MCL?objectName=mcl-257-707a","current_through":"2026-08-14","vintage":"open-us-law v2026.08, retrieved 2026-09-14","retrieved_at":"2026-09-14T18:32:31Z","sha256":"65e52d71131fbb95fea8bf556fbab854853f0fc4d5bb9dafc8be0f793e93a149","source_id":"us-mi","stale":false,"prev":"us-mi/mich.-comp.-laws-257.707","next":"us-mi/mich.-comp.-laws-257.707b"},"notice":"GroundRules: Original legal text. Not legal advice."}