| http://www.w3.org/ns/prov#value | - A detectable warning is ???A standardized surface feature built in or applied to walking surfaces or other elements to warn of hazards on a circulation path.??? (F106.5, Draft Final ADA and ABA Accessibility Guidelines, April 2, 2002) It is a unique and standardized feature, intended to function much like a stop sign and to alert pedestrians who are visually impaired to the presence of a hazard in
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