Sec. 23-15. Exemptions.
None of the terms or prohibitions of Sections 23-12 through 23-17 shall apply to or be enforced against:
a. Any vehicle of the City while engaged upon necessary public business.
b. Excavations or repairs of bridges, streets or highways by or on behalf of the City or the State, at night, when the public welfare and convenience renders it impossible to perform such work during the day.
c. The reasonable use of amplifiers or loudspeakers in the course of public addresses which are noncommercial in character, and which amplifiers or loudspeakers are not used in connection with any moving vehicle.
d. The use of a hand-operated device producing not in excess of seventy decibels of sound, "C" scale, measured a distance of fifty feet from the instrument emanating sound from bicycles, pushcarts, or other vehicles, or from vehicles in connection with the sale or display of merchandise; provided, that such devices or musical systems:
1. Shall be operated only while the bicycle, pushcart or vehicle is in motion;
2. Shall play only pleasing melodies; and
3. Shall not be played between the hours of 1:00 p.m. and 3:00 p.m., and between the hours of 9:00 p.m. and 10:00 a.m. (Code 1962, § 26-4; Ord. No. G-3581, § 1)