About: http://webisa.webdatacommons.org/233954079

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	What has been described is an apparatus for installation and use at a railroad crossing to warn the operators of a train approaching the crossing when a vehicle, person, animal, or other object is in the crossing.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com