Permittee shall provide “wide load” signs as necessary to be visible from both the front and rear of all loads in excess of 10 feet in width. Signs shall be at least three feet by five feet in dimension; shall have a yellow background with black lettering; shall spell out “WIDE LOAD” in bold letters; and shall have an amber flasher mounted on each of the upper corners of such sign. (Ord. 1205 § 2, 1969; prior code § 27.216(5)).