No sign as regulated by this chapter shall be erected at or near an intersection of any street in such a manner as to obstruct free and clear vision, nor 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", "look", "danger" or any other word, phrase, symbol or character in such manner as to interfere with, mislead or confuse traffic.