What is the maximum allowable slope for outdoor parking lots?

[Eddie]

Parking lot slopes should not be excessively steep to prevent vehicle rollaway. The minimum longitudinal slope is 0.3%, with maximum longitudinal slopes of 1% parallel to the driveway and 3% perpendicular to the driveway. The slope of entrance/exit driveways should preferably be between 0.5%-2%, with a maximum slope not exceeding 7% under difficult conditions. Total parking spaces: Residential parking lots and garages should allocate no less than 0.5% of total spaces as accessible parking spaces for disabled drivers. When multiple parking facilities exist, each location should provide at least one accessible parking space. Accessible parking spaces: Accessible parking spaces in surface lots should be located near parking lot entrances/exits. Where possible, residential areas should position accessible spaces near residential building entrances.