As used in this chapter, unless the context otherwise requires:
(1) “Commission” means the State Highway Commission of the State of Arkansas;
(2) “Construction” and “constructing” when said with reference to ferries include the terms “purchase” and “purchasing”, respectively;
(3) “General Bridge Authority Act” has reference to 33 U.S.C. § 525 et seq.; and
(4) “Revenue” means revenue or income derived solely from tolls, rents, fees, and other charges imposed by the commission for services rendered by a bridge constructed or reconstructed, or by a ferry constructed under the provisions of this chapter, and shall not be deemed in any event to include any revenues or funds of the State of Arkansas.