25-635 - Maximum driveway grade LAST AMENDED 12/5/2024 R1 R2 R3 R4 R5 In the districts indicated, the maximum grade of a driveway shall not exceed 11 percent in any #front yard#. Driveways existing on April 30, 2008, which exceed a grade of 11 percent, may be used to access parking spaces provided for #residences# constructed after April 30, 2008.