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2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)

DETECTABLE WARNING.

A standardized surface feature built in or applied to walking surfaces or other elements to warn persons with visual impairments of hazards on a circulation path.

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Advisory Definition of DETECTABLE WARNING. Curbs can be used by pedestrians with vision impairments to detect the boundary between a sidewalk and a vehicular way. Curb ramps remove the needed cues for persons with visual impairments; detectable warnings have been developed as a replacement cue and warning to indicate the presence of a vehicular way. ◼

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