(1) The provisions of section 61-13-103(1) , MCA, forbidding operation of a motor vehicle unless each occupant of a designated seating position is wearing a seatbelt, do not apply to an occupant of a motor vehicle who must in the course of his or her official job duties make such frequent stops that the public interest is best served by allowing an exemption.   An occupant of a motor vehicle meets this requirement for exemption if, while performing his or her official job duties, the occupant:

(a) normally and as a matter of routine operates or rides in a motor vehicle;

(b) normally and as a matter of routine makes ten or more stops per mile;

(c) must exit the vehicle at the required stops; and

(d) carries an exemption certificate issued by the department.

(2) The following occupants of a motor vehicle are exempt from the provisions of section 61-13-103(1) , MCA, if they are engaged in their official duties and are carrying an exemption certificate:

(a) persons providing garbage service;

(b) persons delivering newspapers house-to-house;

(c) persons making rural mail delivery.