Hawaii Revised Statutes Division 1. Government § 271-21

(a) Every common carrier by motor vehicle shall file with the public utilities commission, and print, and keep open to public inspection, tariffs showing all the rates, fares, and charges for transportation, and all services in connection therewith, of passengers or property. The rates, fares, and charges shall be stated in terms of lawful money of the United States. The tariffs required by this section shall be published, filed, and posted in such form and manner, and shall contain such information as the commission by regulations shall prescribe; and the commission may reject any tariff filed with it which is not in consonance with this section and with the regulations. Any tariff so rejected by the commission shall be void and its use shall be unlawful.

(b) No common carrier by motor vehicle shall charge or demand or collect or receive a greater or less or different compensation for transportation or for any service in connection therewith between the points enumerated in the tariff than the rates, fares, and charges specified in the tariffs in effect at the time; and no carrier shall refund or remit in any manner or by any device, directly or indirectly, or through any agent, or otherwise, any portion of the rates, fares, or charges so specified, or extend to any person any privileges or facilities for transportation except such as are specified in its tariffs.

(c) No change shall be made in any rate, fare, charge, or classification, or any rule, regulation, or practice affecting the rate, fare, charge, or classification, or the value of the service thereunder, specified in any effective tariff of a common carrier by motor vehicle; except after thirty days' notice of the proposed change filed and posted in accordance with subsection (a) of this section. The notice shall plainly state the change proposed to be made and the time when it will take effect. The commission may in its discretion and for good cause shown allow the change upon notice less than that herein specified or modify the requirements of this section with respect to posting and filing of tariffs either in particular instances or by general order applicable to special or peculiar circumstances or conditions.

(d) No common carrier by motor vehicle shall engage in the transportation of passengers or property unless the rates, fares, and charges upon which the same are transported by the carrier have been filed and published in accordance with this chapter.