The legislative body of any city or town acting through a planning commission created pursuant to chapter 35.63 RCW, or pursuant to its granted powers, may prepare a comprehensive land use plan to become effective upon the annexation of any area which might reasonably be expected to be annexed by the city or town at any future time. Such comprehensive plan, to the extent deemed reasonably necessary by the legislative body to be in the interest of health, safety, morals and the general welfare may provide, among other things, for:
All such regulations and restrictions shall be designed, among other things, to encourage the most appropriate use of land throughout the area to be annexed; to lessen traffic congestion and accidents; to secure safety from fire; to provide adequate light and air; to prevent overcrowding of land; to avoid undue concentration of population; to promote a coordinated development of the unbuilt areas; to encourage the formation of neighborhood or community units; to secure an appropriate allotment of land area in new developments for all the requirements of community life; to conserve and restore natural beauty and other natural resources; to facilitate the adequate provision of transportation, water, sewerage and other public uses and requirements.
RCW 35.13.177