61-9-421. Certain vehicles exempt. Section 61-9-420 is not applicable to a vehicle that:

(1) is a motorbus, schoolbus, taxicab, moped, quadricycle, or motorcycle or is not required to be equipped with safety belts under 49 CFR 571 as it reads on January 1, 1984; or

(2) has a seating capacity as designated by the manufacturer of two persons and there are two persons 4 years of age or older in the vehicle.