Section 178 - Rates and charges; common carriers1. It shall be the duty of every common carrier of property to establish, observe and enforce just and reasonable rates, charges and classifications, and just and reasonable regulations and practices relating thereto.2. Common carriers of property by motor vehicle may establish through routes and joint rates, charges and classifications with other such carriers and once established it shall be the duty of all such carrier parties to establish just and reasonable rates, charges, classifications, regulations and practices and equitable divisions of revenue.3. All charges made for any service rendered, or to be rendered by any common carrier of property by motor vehicle, shall be just and reasonable, and every unjust and unreasonable charge for such service or any part thereof, is prohibited and declared to be unlawful. It shall be unlawful for any common carrier to make, give or cause any undue or unreasonable preference or advantage to any particular persons, in any respect whatsoever; or to subject any particular person to any unjust discrimination or any undue or unreasonable prejudice or disadvantage in any respect whatsoever.4. Whenever, after a hearing, upon complaint, or in an investigation on the commissioner's own initiative, the commissioner shall determine that any individual or joint rate, charge or classification in effect or proposed to be put into effect by any common carrier or group of common carriers of property by motor vehicle or any rule, regulation or practice whatsoever affecting such rate, charge or classification, or the value of the service thereunder, is or will be unjust or unreasonable, or unjustly discriminatory, unduly preferential or unduly prejudicial, the commissioner shall determine and prescribe the lawful rate, charge or classification, or the lawful rule, regulation or practice thereafter to be observed.5. The commissioner shall, whenever deemed by him to be necessary or desirable in the public interest, after a hearing, upon complaint, or upon the commissioner's own initiative, establish through routes and joint rates, charges, classifications, regulations or practices, applicable to the transportation of property by common carriers and the terms and conditions under which such through routes shall be operated.6. Whenever, after a hearing, upon complaint or upon the commissioner's own initiative, the commissioner determines that the divisions of joint rates, charges or classifications applicable to the transportation of property by common carriers are or will be unjust, unreasonable, inequitable, or unduly preferential or prejudicial as between the carrier parties, the commissioner shall by order prescribe the just, reasonable and equitable divisions thereof. The order of the commissioner may require the adjustment of divisions between the carriers, in accordance with the order, from the date of filing the complaint or entry of order of investigation, or such other date subsequent as the commissioner finds justified and, in the case of joint rates, charges or classifications prescribed by the commissioner, the order as to divisions may be made effective as a part of the original order.7. In proceedings to determine the reasonableness of rates, charges or classifications of a common carrier of property or group of common carriers of property, the commissioner shall authorize revenue levels that are adequate under efficient management to cover total operating expenses, plus a reasonable profit as determined by the commissioner.8. The commissioner may not investigate, suspend, revise or revoke any rate or charge proposed by a carrier if the proposed rate does not increase or reduce any existing rate or charge by more than ten percent in any twelve month period. This subdivision does not apply to rates that are proposed through the collective actions of the members of a rate conference.9. Any rate or charge that in any twelve-month period is increased or reduced by more than the percentage specified in subdivision eight of this section must be accompanied by such financial, statistical, cost and other data as the commissioner may prescribe by regulation to justify such change. Any such rate or charge is subject to investigation, suspension, revision or revocation.