(2) The purpose of ORS 390.950 to 390.989 and 390.995 (2) is to provide the means for attaining these objectives by instituting a system of recreation trails in this state, by designating certain trails as the initial components of that system, and by prescribing the methods of which, and standards according to which, additional components may be added to the system. [1971 c.614 §3]