(a) Except as otherwise provided in subsection (b) of this Code section, this article shall not apply to private carriers engaged exclusively in the transportation of goods belonging to the individual, firm, partnership, corporation, or association owning, controlling, operating, or managing the motor vehicle in private transportation over any public highway in this state.

(b) The commissioner shall have the authority to promulgate rules designed to promote safety of private carriers. Every motor vehicle of a private carrier and all parts thereof shall be maintained in a safe condition at all times; and the carrier's equipment shall meet such safety requirements as the commissioner shall from time to time promulgate.

(c) Private carriers are not required to hold certificates of public convenience and necessity or registration permits issued by the commissioner.