Driveways should have a maximum grade of (15) percent. Driveways and curb cuts shall be located not less than three (3) feet from the side lot line. Curb cuts for straight curbs and the flare for rolled curbs shall be three (3) feet wider than the driveway on each side. The subdivider or developer shall place the approved drainage structures under intersecting roads, drives, lanes or property entrances and at other locations where required. Driveways shall be designed so as to drain into the roadside ditch and not into the roadway surface.