No signs to be displayed in certain places. No sign shall be placed upon a balcony, porch, canopy, shed, roof, parapets (or similar appurtenance), door or window, or placed in any manner whatsoever so as to disfigure or conceal any architectural feature or detail of any building. Signs shall be prohibited which are attached to or painted upon a fence, tree, standpipe, fire escape, utility pole or similar appurtenance. No sign shall be erected at any street intersection in a manner which will obstruct free vision or at any place where the position, shape or color of the sign may interfere or be confused with any traffic sign or signal or which makes use of the words "stop," "danger" or any other word, phrase or symbol which may mislead traffic. No sign or sign structure other than official street, traffic or highway markers shall be placed upon any street or highway right-of-way. Signs painted on buildings are prohibited.