Our design guidelines call for a maximum driveway slope of 10% for standard residential driveways, but an applicant is seeking something along the lines of 20%... One concern about a steep driveway is the vehicle bottoming out and scraping the ground where the grade changes from angled to flat.
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In order to comply with the American Disabilities Act (ADA), the maximum ramp gradient is 1:20
maximum slope is 1 in 12 = 8.33 in 100 = 8.33 % grade
A semi-circular driveway.
The answer depends on the shape of the driveway, and its dimensions.