(1) The comprehensive road funding fund is created in the state treasury.

    (2) The state treasurer shall deposit money and other assets received from any source in the fund. The state treasurer shall direct the investment of money in the fund and credit interest and earnings from the investments to the fund.

    (3) The department is the administrator of the fund for audits of the fund.

    (4) The department shall expend money from the fund, on appropriation, only for the implementation and administration of this act.

    (5) Money in the fund at the close of the fiscal year remains in the fund and does not lapse to the general fund.