2013 California Standards for Accessible Design Pocket Guide
11B-404.2.4.4 Floor or ground surface.
Floor or ground surface within required maneuvering clearances shall comply with Section 11B-302. Changes in level are not permitted.
Exceptions:
1. Slopes not steeper than 1:48 shall be permitted.
2. Changes in level at thresholds complying with Section 11B-404.2.5 shall be permitted.
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