The purposes of this Zoning Bylaw are, among other purposes, to lessen congestion in the streets; to conserve health; to secure safety from fire, flood, panic and other dangers; to provide adequate light and air; to prevent overcrowding of land; to encourage housing for persons of all income levels; to avoid undue concentration of population; to facilitate the adequate provisions of transportation, water, water supplies, drainage, sewerage, schools, parks, open space and other public requirements; to conserve the value of land and buildings, including the conservation of natural resources and the prevention of blight and pollution of the environment; to encourage the most appropriate use of land throughout the Town of Shrewsbury; and to preserve and increase its amenities.