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ADAAG Manual

Note: This document, portion of document or referenced document was published prior to the 2010 ADA Standards, and all or part of this information may only apply to Safe Harbored elements.

Detectable Warnings on Walking Surfaces [4.29.2]

Detectable warnings are intended to alert pedestrians of an imminent hazard but are not designed as wayfinding devices. Research indicates that the most effective detectable warning:

  • has a unique texture distinct from other common surfaces in the environment

  • adjoins or abuts the hazard to signal impending change

  • extends beyond the average stride length so that one can detect, understand, and react to it before encountering the hazard

The truncated dome specification and intended offset pattern was found to be the most effective in providing a distinct patterning detectable by cane and underfoot. The degree of truncation, which is not specified, varies according to the manufacturer.

Plan and elevation diagram showing typical dome diameter, height and spacing

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