Looking for the answer to this -- what's the maximum driveway slope permitted in your area? 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. Another would be the driveway being too steep to negociate in the winter.
We also call for the slope from the PL to the street to slope downwards towards the street at no more than 2%, which is part of the problem in this case.
I don't have much experience in the field of driveways... so what's your experience with steep residential driveway grades? How steep can they be?