(a) On and after the date that the commissioner has certified the sums allocated to each local government, the sums shall be available for expenditure under the provisions of this chapter.
(b) These allocated sums shall be available for expenditure for a period of five years after the close of the fiscal year for which the sums are authorized and any amounts so obligated remaining unexpended at the end of that period shall lapse and shall be available for other local service road or trail construction within that allocation district in accordance with AS 19.30.111 - 19.30.241.
(c) This section applies to sums transferred under AS 19.30.151(b).
(d) The payment of royalties required to obtain materials to construct local service road and trail projects is a valid expenditure under this chapter.