All federal funds received by the director of the Office of Treasury and Fiscal Services under Code Section 32-5-1 are continually appropriated to the department for the purpose specified in the grants of such funds except as such funds may be directed by the federal government to the State Road and Tollway Authority, provided that no federal funds or funds appropriated to the department shall be expended for procurement of rights of way for a road to be constructed on a county road system except as otherwise provided by law or by agreement between the federal government and the department.