The director may accept any allotment of funds by the United States, or any agency thereof, appropriated to carry out the purposes of Section 131, Title 23, United States Code, as amended, from time to time. The director shall take such steps as may be necessary, from time to time, to obtain from the United States, or the appropriate agency thereof, funds allotted and appropriated, pursuant to Section 131, Title 23, United States Code, for the purpose of paying the federal government’s 75 percent share of the just compensation to be paid to sign owners and owners of real property under the terms of subsection (g) of Section 131, Title 23, United States Code, and Sections 23-1-280 through 23-1-282.