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<http://webisa.webdatacommons.org/prov/379094009>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/37117517> .
<http://webisa.webdatacommons.org/37117517>	<http://www.w3.org/ns/prov#value>	"safe clearance distances R1 and R2 are contained in a database and is a function of vehicle velocity and type." .
<http://webisa.webdatacommons.org/37117517>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<patents.com> .