the number, type and size of authorised F1heavy goods vehicles which may at any one time be at any operating centre of the licence-holder for the purposes of maintenance and parking;

the parking arrangements to be provided for authorised F2heavy goods vehicles at or in the vicinity of every such operating centre;

the times between which there may be carried out at every such operating centre any maintenance or movement of any authorised F3heavy goods vehicle and the times at which any equipment may be used for any such maintenance or movement; and

the means of ingress to and egress from every such operating centre for any authorised F4heavy goods vehicle .