<http://webisa.webdatacommons.org/prov/8715074>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/7872738> .
<http://webisa.webdatacommons.org/7872738>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<mackinac.org> .
<http://webisa.webdatacommons.org/7872738>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/7872738>	<http://www.w3.org/ns/prov#value>	"While the biggest problems are currently in ports, airports and rail yards; highways are also a problem, especially in urban areas.[107]" .