Section 9-20-5 - Assumption of risk in use of off-road vehicles(a) Notwithstanding the provisions of § 9-20-4, in any legal action against the state or any political subdivision thereof, an operator or passenger of: (1) a recreational vehicle as defined in § 31-3.2-1(8) or(2) a snowmobile as defined in § 31-3.2-1(11), or(3) an all terrain vehicle (A.T.V.), or (4) a motor vehicle primarily designed for use off public roads, shall while on state property assume as a matter of law the risks inherent in such operation insofar as they are obvious and necessary.(b) The director of the department of environmental management shall post signs warning operators and passengers that they assume the risk of injury while on state property. Provided, however, that the lack of signs shall not be admissible in a suit for negligence.P.L. 1987, ch. 535, §1; P.L. 1997 , ch. 326, § 71; P.L. 2004 , ch. 6, § 8.