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The following signs shall be prohibited in all districts in the city:
804.1. Traffic or safety hazards. Signs determined by the building official to constitute a traffic or other safety hazard by reason of size, location, or type of illumination including A-frame signs and mobile signs.
804.2. Signs that move. Signs which move by mechanical means or by ambient wind currents, flashing or animated signs (not including flags and banners).
804.3. Billboards.
804.4. Bulletin boards. Signs used as a bulletin or notice board to announce activities and events.