The department is authorized to liquidate and close toll facility trust and other facility accounts established outside the state treasury under chapter 47.56 RCW after the removal of tolls from the facility for which the accounts were established. Any balance remaining in the accounts shall thereupon be transferred to the motor vehicle fund. In addition, the department may, after the removal of tolls from a particular facility or facilities, require that all moneys transferred to the place of payment named in the revenue bonds, for the purpose of paying principal or interest or for redemption of the bonds not then expended for such purpose, be returned to the state treasurer for deposit in the motor vehicle fund.