2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)
11B-305.7 Maneuvering clearance.
Where a clear floor or ground space is located in an alcove or otherwise confined on all or part of three sides, additional maneuvering clearance shall be provided in accordance with Sections 11B-305.7.1 and 11B-305.7.2.
11B-305.7.1 Forward approach.
Alcoves shall be 36 inches (914 mm) wide minimum where the depth exceeds 24 inches (610 mm).
11B-305.7.2 Parallel approach.
Alcoves shall be 60 inches (1524 mm) wide minimum where the depth exceeds 15 inches (381 mm).
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