About: http://webisa.webdatacommons.org/444537881

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	When the driver of a first vehicle wishes to signal one or more drivers of other vehicles, the first driver activates a switch, for example the horn button on a steering wheel or the siren switch in a police car.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com