SIGNS NOT TO CONSTITUTE VEHICULAR TRAFFIC HAZARD: No sign shall be erected at the intersection of any street, railroad grade crossing, or at any driveway in such a manner as to obstruct free and clear vision of motor vehicles or at any location where, by reason of the position, shape or color, it may interfere with, obstruct the view of, or be confused with any authorized traffic sign, signal or device; or which makes use of the words "STOP," "DANGER," or any other word, phrase, symbol, or character in such manner as could interfere with, mislead or confuse traffic (See § 36-18.23, Vision Obstructions).