Where any political subdivision of the State of Arkansas has entered into an agreement with the United States Government, any agency or subdivision thereof, or the State Highway Commission to maintain projects constructed off the state highway system by the commission, with the use of United States governmental funds, upon written notice to the commission from the Federal Highway Administration that projects are being maintained insufficiently according to the agreement, the commission is authorized, ordered, and empowered to instruct the Treasurer of State to withhold payment from the County Aid Fund, which is payable or to be payable to the various political subdivisions of the State of Arkansas, if the commission, after investigation, finds the political subdivisions have failed to live up to the agreement.