Limitations on governmental liability in snowmobile accidents are a fairly recent phenomenon. (See Shockey v. Shields (1975), 272 Or. 226, 536 P.2d 424; Watson v. Zanotti Motor Co. (1971), 219 Pa. Super. 96, 280 A.2d 670; see also Annot., 42 A.L.R.3d 1422 (1972).) Since section 5-1(I) has never been reviewed by this court, the plaintiff bases his argument on related constitutional concepts.