In an October 2000 letter to then- state Conservation Secretary John Oliver, the Conservation & Natural Resources Advisory Council noted that the illegal operation of all-terrain vehicles "on state forest land is the predominant enforcement problem for Bureau of Forestry staff." More recently in a 2006 study, the forestry bureau said there are 2,535 miles of illegal ATV trails on state forest land. The state forests already are home to 247 miles of ATV trails. In addition, there are more than 100 miles of ATV trails in Allegheny National Forest and countless other miles on private property.