The department shall retain toll charges on all existing and future facilities until all costs of investigation, financing, acquisition of property, and construction advanced from the motor vehicle fund, and obligations incurred under RCW 47.56.250 and chapter 16, Laws of 1945 have been fully paid.
(1) Except as provided in subsection (2) of this section, with respect to every facility completed after March 19, 1953, costs of maintenance and operation shall be paid periodically out of the revenues of the facility in which such costs were incurred.
(2) Where a state toll facility is constructed under chapter 47.46 RCW adjacent to or within two miles of an existing bridge that was constructed under this chapter, revenue from the toll facility may not be used to pay for costs of maintenance on the existing bridge.