No sign shall have visible moving, revolving or rotating parts or visible mechanical movement of any kind, except for the movable hands on street clocks, or other apparent visible movement achieved by electrical, electronic or mechanical means, which changes every 15 seconds or less.
(1998 Code, § 98-101) (Ord. 93-69, passed 11-17-1993; Ord. 99-28, passed 5-5-1999) Penalty, see § 155.999