About: http://webisa.webdatacommons.org/451279963

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	Any tread obstacles, such as rocks or roots, imbedded into the trail surface should be less than 2 inches.
http://www.w3.org/ns/prov#wasQuotedFrom	iowadot.gov