In order that the public health, safety, morals and general welfare be furthered in an era of increasing urbanization and of growing demand for housing of all types and design; to provide for necessary commercial and educational facilities conveniently located to such housing; to provide for well-located, clean, safe, pleasant industrial sites involving the minimum strain on transportation facilities; to encourage innovations in residential, commercial and industrial development so that growing demands of the population may be met by a greater variety in type, design and layout of buildings and by the conservation and more efficient use of open space land ancillary to said buildings; so that greater opportunities for better housing in recreation, shops and industrial plants conveniently located to each other may extend to all citizens and residents of this state; and in order to encourage a more efficient use of land and of public services, or private services in lieu thereof, and to reflect changes in the technology of land development so that resulting economies may benefit those who need homes; to lessen the burden of traffic on streets and highways; to encourage the building of new housing development incorporating the best features of modern design; to conserve the value of land; and, in light of these purposes, to provide a procedure which can relate to type, design and layout of residential, commercial and industrial development to the particular site and the particular demand for housing and other facilities including the foregoing at the time of development in a manner consistent with the preservation of property values within established residential areas and to assure that the increased flexibility of substantive regulations over land development authorized herein is subject to such administrative standards and procedures as shall encourage the disposition of proposals for land development without undue delay.