Whenever, by this article, any traffic regulation is imposed or specified, or parking is prohibited, it shall be the duty of the board of education of the Mayville Community School District to determine the proper placement of and cause to be erected all necessary and appropriate regulatory signs, the contents of which shall provide notice of the applicable traffic or parking regulation. No traffic regulation or prohibition as provided in this article shall be effective unless such signs are erected and in place at the time of any alleged offense in compliance with section 66-126. (Comp. Ords. 1987, § 20.555)