The proceeds realized from the sale of bonds under the provisions of this act shall be paid into the State Treasury, and shall be set apart and be kept in a separate fund, which shall be known as "The State Bond Road Fund."
All moneys in the State Bond Road Fund from time to time are hereby specifically appropriated to the Department of Highways, for the purpose of improving and rebuilding the highways of the Commonwealth.
The Auditor General shall, upon requisition, from time to time, of the Secretary of Highways, draw his warrant upon the State Treasury for the amounts specified in such requisitions, not exceeding, however, the amount in such fund at the time of making such requisitions.
72 P.S. § 3984