About: http://webisa.webdatacommons.org/159669452

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The guidelines define a detectable warning as a standardized surface feature built in or applied to walking surfaces or other elements to warn visually impaired people of hazards on a circulation path.
http://www.w3.org/ns/prov#wasQuotedFrom	dot.gov