Objections may thus be made to show : (a) that it is not necessary in the public interest for the concerned road transport services to be operated by the S.T.U.; (b) that it is not necessary in the public interest that such services be taken over by the S.T.U. to the complete exclusion (if such exclusion is envisaged by the scheme) of other persons and that their partial exclusion would suffice; (c) that it is not necessary in the public interest that such ser vices shall be taken over by the S.T.U. even to the partial exclusion of others; (d) that the scheme is not calculated to provide an efficient road transport service; (e) that the scheme would not provide an adequate road transport service; (f) that the road transport service envisaged by the scheme would not be economical, or (g) that the road transport service provided for by the scheme would suffer from lack of proper coordination.