(1) Carriers may elect either to file their own tariff or become a participating carrier in an authorized section 5(b) bureau.

(2) Tariffs may be filed with the commission by groups or bureaus.

(3) To obtain authorization to operate in intrastate commerce as a rate bureau, an application, which contains the items in 69-12-601 through 69-12-605, MCA, shall be made to the commission.