17.—Whenever the Minister grants a merchandise licence he may attach to such licence such conditions as he shall think proper and shall specify in such licence and in particular and without prejudice to the generality of the foregoing power, conditions in respect of all or any of the following matters, that is to say:—

(a) the wages and conditions of employment of employees engaged in the operation of the vehicles used for the purposes of the licensees business of merchandise road transport;

(b) the notification to and approval by the Minister of agreements or arrangements made in relation to such business by the licensee with other persons engaged in the transport of merchandise by rail, road, air, or water;

(c) the use, either exclusively or to a specified extent, of vehicles manufactured in whole or in part in Saorstát Eireann, and the maintenance thereof.