(a) Definitions. As used in this act: (i) "Emergency vehicle" means as defined in W.S. 31-5-1302(a)(iii); (ii) "Passenger vehicle" means a vehicle which is self-propelled and designed to carry eleven (11) persons or less and primarily used to transport persons, including autocycles and pickup trucks but excluding emergency vehicles, motorcycles and buses; (iii) "Police officer" means as defined in W.S. 31-5-102(a)(xxxiii); (iv) "Safety belt" means a passenger restraint which was installed when the vehicle was manufactured; (v) "Vehicle" means as defined in W.S. 31-5-102(a)(lviii); (vi) "This act" means W.S. 31-5-1401 and 31-5-1402.