About: http://webisa.webdatacommons.org/383889722

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	These markers help travelers identify the trail corridor when the tread is indistinct, the ground is covered with snow, or when the route is confused by multiple trails or obscured by weather, such as dense fog.
http://www.w3.org/ns/prov#wasQuotedFrom	dot.gov