2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)
11B-406.5.12 Detectable warnings
Curb ramps and blended transitions shall have detectable warnings complying with Section 11B-705.
U.S. Access Board's Note to Reader:
The Department of Transportation's ADA Standards require detectable warnings on curb ramps:
[ADA Title II - Public Transportation] 406.8 Detectable Warnings. A curb ramp shall have a detectable warning complying with 705. The detectable warning shall extend the full width of the curb ramp (exclusive of flared sides) and shall extend either the full depth of the curb ramp or 24 inches (610 mm) deep minimum measured from the back of the curb on the ramp surface.
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