4Where the proposed order authorises the stopping up or diversion of a highway, the Minister or the local highway authority, as the case may be, shall, not later than the day on which the said notice is published or, if it is published on 2 or more days, the day on which it is first published, cause a copy of it to be displayed in a prominent position at the ends of so much of any highway as is proposed to be stopped up or diverted under the order.