Plantings of evergreen material shall be provided in off-street parking areas of more than four (4) vehicles. In lieu of screen planting, a fence of woven lattice, masonry wall, or wooden louvre type or split cedar fence with a maximum of three-fourths (3/4) inch spacing may be provided not less than four (4) feet nor more than six (6) feet in height, maintained in good condition and without advertising. This provision shall not apply to the Industrial Districts, except where the lot is adjacent to a residential zone boundary line.