Wash. Rev. Code § 47.60.300
The review shall include but not be limited to tariffs for automobiles, passengers, trucks, commutation rates, and volume discounts. The review shall give proper consideration to time of travel, distance of travel, operating costs, maintenance and repair expenses, and the resultant effect any change in tariff might have on the debt service requirements of the department as specifically provided in existing financing programs. The review shall also include the allocation of vessels to particular runs, the scheduling of particular runs, the adequacy and arrangements of docks and dock facilities, and any other subject deemed by the department to be properly within the scope of the review. The department is further authorized and directed to make a like review within every three-year period.
RCW 47.60.300