None of the terms or prohibitions of section 30-93 shall apply to or be enforced against: Any police or fire vehicle or any ambulance, while engaged upon necessary emergency business. Necessary excavations in or repairs of bridges, streets or highways or any public utility installation by or on behalf of the village or any public utility or any agency of the state, during the night or on Sunday, when the public safety, welfare and convenience necessitates the performance of the work at such times. The reasonable use of stationary amplifiers or loudspeakers for public addresses which are noncommercial in character. 7/27/26, 10:12 AM Mayville, MI Code of Ordinances about:blank 71/202 (5) The use of sound amplifiers or other such devices by churches or other organizations approved by the council. Trains. (Comp. Ords. 1987, § 20.693)