2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)
1131A.1 Changes in level not exceeding ½ inch.
Abrupt changes in level along any accessible route shall not exceed ½ inch (12.7 mm). When changes in level do occur, they shall be beveled with a slope no greater than 1 unit vertical in 2 units horizontal (50-percent slope). Changes in level not exceeding ¼ inch (6.35 mm) may be vertical.
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