Whenever a subdivision is developed as a planned development under the appropriate provisions of the zoning ordinance, wherein adequate park or recreation area is provided, through traffic is cared for adequately and the majority of the minor streets are of the cul-de-sac or loop type, the Planning Commission may vary the design requirements of these regulations, in order to allow the subdivider more freedom in the arrangement of streets and lots, but at the same time protect the convenience, health, safety and welfare of the entire community. In no case, however, shall the overall density, intensity of use or land area coverage for the planned development exceed those minimums established in the zoning ordinance for the district in which such uses would normally be located.