About: http://webisa.webdatacommons.org/124821498

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	Flexible speed limits and warning displays that can be varied to match traffic and environmental conditions, including fog, have been in use for over 30 years.
http://www.w3.org/ns/prov#wasQuotedFrom	bts.gov