About: http://webisa.webdatacommons.org/300053276

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	Alternatively, or additionally, the visual indicators may be activated by an activation device, for example, a manual switch such as a pedestrian operated push button, sensor, and/or conventional traffic timing mechanism.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com