No franchise, right, or privilege shall be granted or authorized by the Commonwealth or by any political subdivision or court thereof for the acquisition, establishment, construction, maintenance, repair, or operation of any bridge or tunnel or bridge and tunnel facility from any point within the boundaries of the District to a point in the County of Northampton, except to the Commission so long as any bonds issued under this chapter remain outstanding or until provision is first made for the payment of the principal and the interest and the premium, if any, due and payable upon all such bonds, provided that such prohibition does not apply to any ferry that may be established for the exclusive transportation of railroad cars, or of railroad passengers holding through tickets, or to projects heretofore authorized under the Transportation Development and Revenue Bond Act (§ 33.2-1700 et seq.).