36 CFR Part 1191 ABA Accessibility Guidelines, Outdoor Developed Areas - Preamble
1012.5 Slope
This section requires the slope of the surface of parking spaces and pull-up spaces to not be steeper than 1:48 in any direction. Where the surface is other than asphalt, concrete, or boards, slopes not steeper than 1:20 are permitted when necessary for drainage.
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