The regulations relating to the erection of all signs in this district are expressly modified as follows:
(a) Signs in right-of-way. Signs in this district are permitted to overhang the public right-of-way subject to city franchising requirements.
(b) Materials.
(1) The use of plastic is prohibited, except when it is:
(A) used as a decoration (as opposed to a character) on the exterior face of a sign, in which case no more than five percent of the effective area of the sign may consist of plastic;
(B) placed behind the exterior face of a sign in places where that face has been cut in the shape of a character; or
(C) used in or on a marquee sign.
(2) Although not required, painted applied signs and enameled metal sheet signs are encouraged.
(c) Lighting.
(1) The only light sources that may be used to illuminate a sign are cold cathode, neon, and incandescent lamps.
(2) A light source external to a sign may illuminate a sign if the light does not cross into either a public right-of-way or a residential zoning district.
(3) Illuminated signs on translucent fabric are encouraged.
(4) No light used to illuminate a sign may turn on or off, or change its brightness more than twice a day.
(d) Colors. Fluorescent and neon colors on signs are prohibited. (Ord. 21145)