What is the maximum allowable slope for parking spaces?

[VonElliott]

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 drive lanes and 3% perpendicular to drive lanes. Entrance/exit ramp slopes should ideally be 0.5%-2%, with a maximum permissible slope of 7% under difficult conditions. Additional specifications include: 1) Accessible parking spaces in surface lots should be located near parking area entrances/exits, with residential complexes preferably placing them near residential access points when possible; 2) Pedestrian entrances to parking structures must be wheelchair accessible - garages on non-ground floors should provide barrier-free pathways connecting to accessible elevators or stairs leading directly to the ground floor.