(a) 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.