In order to minimize the carrying of mud and other debris onto the streets and to lessen traffic hazards at construction sites, the contractor or builder before proceeding with the construction, enlargement, alteration, repair or removal of any building or other structure, shall construct a driveway of No. 2 stone, six inches thick, from the edge of the pavement to the setback building line. Such driveway shall be at least eight feet in width and constructed in accordance with present specifications in the Building Code, unless a driveway at least equal in specifications is already available and in use.