Buffers and screening. Developments shall provide sufficient buffering and screening of vehicle use areas from adjacent residential uses or properties which are zoned residentially. Buffering and screening may consist of trees and shrubs existing on the site prior to development. Supplemental plantings may be required in addition to the existing vegetation as recommended by the Planning Board in order to improve the screening of the buffer. Buffering and screening may also consist of tree and shrub plantings, earthen berms, fences, walls or a combination of these methods so as to establish an effective visual screen. When fences or walls are utilized for screening, trees and other plant materials (shrubs, vines, ground covers, perennials) shall also be used to soften the appearance of such screens. All fences provided or required shall have an attractive, finished appearance facing any public right-of-way or adjacent property.