A setback of fifty feet shall be provided along the entire perimeter of the development, except where it adjoins a business or industrial district, in which case setback and screening requirements shall be at the discretion of the Planning Commission. Where the development is situated adjacent to a residentially zoned area, a minimum of twenty feet along the exterior property line shall be planted with an evergreen hedge or dense planting of evergreen shrubs not less than four feet in height at the time of planting. Screening facilities shall not obscure traffic visibility within fifty feet of an intersection. Such screening shall be guided by the provisions of Chapter 1290. (Ord. 2712. Passed 8-1-78.)