Screen planting of a dense evergreen material not less than four feet nor more than six feet in height shall be provided in any location where lights from vehicles within an off-street parking area for more than three vehicles may shine directly into windows of adjacent residential buildings. In lieu of screen planting, a wooden fence of woven lattice, masonry wall, or wooden louvre type of split cedar fence with a maximum of three-quarter inch spacing may be provided not less than four feet nor more than six feet in height, maintained in good condition without any advertising thereon.