2016 California Standards for Accessible Design Pocket Guide - Eff. Jan. 1, 2017
11B-502.4 Floor or ground surfaces.
Parking spaces and access aisles serving them shall comply with Section 11B-302. Access aisles shall be at the same level as the parking spaces they serve. Changes in level are not permitted.
Exception: Slopes not steeper than 1:48 shall be permitted.
[2010 ADAS] Advisory 502.4 Floor or Ground Surfaces. Access aisles are required to be nearly level in all directions to provide a surface for wheelchair transfer to and from vehicles. The exception allows sufficient slope for drainage. Built-up curb ramps are not permitted to project into access aisles and parking spaces because they would create slopes greater than 1:48.
Advisory 11B-502.4 Floor or ground surfaces. Accessible parking spaces and access aisles are required to be level (maximum 1:48 slope) in all directions to provide a surface for wheelchair transfer to and from vehicles. The access aisle needs to be adjacent to, and the same required length as the accessible space it serves. Where two parking stalls share the same access aisle, a full depth aisle is required; in diagonal parking, the geometric layout will require additional access aisle depth to satisfy the loading area for both of the adjacent parking stalls as indicated in Figure 11B-502.3.3. ◼
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