75.—(1) A wheeled vehicle first used after 15th January 1931 shall not be equipped with a closet or urinal which can discharge directly on to a road.
(2) A tank, into which a closet or urinal with which a vehicle is equipped empties, and every closet or urinal which does not empty into a tank, shall contain chemicals which are non-inflammable and non-irritant and provide an efficient germicide.