No certificate of occupancy shall be approved by the Zoning Enforcement Officer for a principal building on an approved Subdivision lot unless and until the drainage, water and sewer lines and lateral and subgrade, base course, and pavement binder course for the new subdivision road has been installed, inspected and approved by Public Works Department and Water and Sewer Department.  Upon the granting of the first C.O. the road shall be kept passable and accessible for automobiles and emergency vehicles.