No sign shall be erected at the intersection of any street or road in such a manner as to obstruct free and clear vision or at any location where, by reason of its position, shape or color, it may interfere with, obstruct the view of or be confused with any authorized traffic sign, signal or device by making use of the words "stop," "look," "danger" or any other word, phrase, symbol or character, or red, green or amber illumination or reflection, in such manner as to interfere with, mislead or confuse traffic.