The following signs shall not be permitted in any zoning district within the city:
A. Aerial signs;
B. Animated signs;
C. Bench signs;
D. Billboards;
E. Flashing signs;
F. Pole signs, except for outdoor advertising structures;
G. Portable signs;
H. Rotating signs;
I. Vehicle signs or vehicle-mounted signs;
J. Signs which consist of red, green or amber lights which, in the opinion of the city engineer, could be confused with traffic signals by motorists;
K. Roof signs;
L. Light bulb strings, except as temporary holiday decoration;
M. Obscene advertising; and
N. Off-site signs, except for open house directional signs and public information signs.
(Ord. 93-10-1169 § 2 (part))