About: http://webisa.webdatacommons.org/18617548

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	References 5 and 6 suggest that factors such as the frequency, amplitude, envelope shape, and melodic structure of a warnings can all affect perceived urgency.
http://www.w3.org/ns/prov#wasQuotedFrom	dot.gov