In all cases where lands have been purchased, or may hereafter be purchased, by the forestry reservation commission for forest reservations, where there are public roads, regularly established, running into or through said lands, the commissioner of forestry, under such rules and regulations as the forestry reservation commission is hereby authorized to adopt, may expend a sum not exceeding twenty-five dollars per mile in each year for the maintenance, repair or extension of any such roads, and on roads bordering on reservations one-half of this rate per mile may be expended. All expenses that may thus be incurred shall be subject to the approval of the forestry reservation commission and the governor of the commonwealth, and shall be paid in the same manner as other expenses are provided for in this act.
32 P.S. § 5