The Commissioner may, by legislative instrument, make regulations:-
(a) prohibiting or restricting the driving of motor vehicles or any class of motor vehicles on the highway or on any specified highway or part of a highway at specified periods on the prescribed date;
(b) requiring any class of motor vehicles designed for left-hand traffic to be modified structurally;
(c) requiring motor vehicles designed for left-hand traffic to be provided with such signals, signs or other devices as may be prescribed;
(d) requiring the provisions of reflective safety markings on any class of motor vehicles;
(e) regulating the speed at which motor vehicles may be driven within a period of six months after the prescribed date;
(f) otherwise for carrying out the principles and purposes of this Decree.