Such regulations shall be made in accordance with a Comprehensive plan, and designed to lessen congestion on roads and highways; to secure safety from panic and other danger; to promote health and the general welfare to avoid undue congestion of population; to facilitate the adequate provision of transportation, water, sewerage, schools, parks and other requirements. It is not the intent of this chapter to restrict, control or place hardship upon the continued agricultural use of land within its area or jurisdiction and control.