About: http://webisa.webdatacommons.org/167623434

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	Seems to me the light is mainly to give those turning left a chance to do so if traffic is too heavy to allow them right of way.
http://www.w3.org/ns/prov#wasQuotedFrom	bikeportland.org