23.—(1) The sign shown in diagram 560 or diagram 561 shall be so placed that the top of the sign is not less than 550 millimetres nor more than one metre above the surface of the carriageway in the immediate vicinity.
(2) Where the sign shown in diagram 560 or diagram 561 is mounted on a post specially provided for the purpose, that part of the post which extends above ground level shall be coloured black and white in alternate horizontal bands, each band being not less than 225 nor more than 350 millimetres in depth.
(3) The signs shown in diagrams 560 and 561 shall be so erected as to display the colour red on the left-hand edge of the carriageway viewed by the drivers of approaching vehicles and the colour white on the right-hand edge of that carriageway so viewed as aforesaid unless the said right-hand edge is the edge of the central reservation of a dual carriageway when the said signs shall be so erected as to display the colour amber on the said right-hand edge viewed by those drivers instead of the colour white.
24. The road marking shown in diagram 1001 shall not be placed on a road unless it is so placed for use in conjunction with the light signals prescribed by paragraph (2) or paragraph (4) of Regulation 31 or those light signals as varied in accordance with Regulation 32 of the Regulations or unless it is so placed at a site where vehicular traffic is from time to time controlled by the police.
25. The road markings shown diagrams 1002 and 1022 shall not be placed on a road unless they are so placed for use in conjunction with the sign shown in diagram 601.1 or until the 31st December 1981 inclusive of that date, with any sign which can be treated as if prescribed by the Regulations until that date if it is a sign of the type shown in the diagram numbered 601 in Schedule 1 to the Traffic Signs Regulations 1964; and the road marking shown in diagram 1003.4 shall not be so placed as aforesaid unless it is placed for use in conjunction with the sign shown in diagram 611.1.
26.—(1) Subject to sub-paragraph (4) of this paragraph, the road marking shown in diagram 1017 may be placed on a side of a road only for the purpose of indicating a statutory prohibition or restriction on the waiting of vehicles which applies on that side for at least eight hours during the period from 7a.m. to 7p.m. on at least four days other than a Sunday in any week.
(2) Subject as aforesaid, the road marking shown in diagram 1018 may be placed on a side of a road only for the purpose of indicating a statutory prohibition or restriction on the waiting of vehicles which applies on that side for at least eight hours during the period from 7am to 7p.m. on at least four days Other than a Sunday in any week and at some other times other than those during the period from 7am to 7 p.m.
(3) Subject to sub-paragraph (5) of this paragraph, the road marking shown in diagram 1016.1 may be placed on a side of a road only for the purpose of indicating a statutory prohibition or restriction on the waiting of vehicles which does not fall to be indicated by the road markings mentioned in sub-paragraphs (1) and (2) of this paragraph.
(4) In sub-paragraphs (1) and (2) of this paragraph the references to a statutory prohibition or restriction or the waiting of vehicles shall be construed as excluding references to any such prohibition or restriction as aforesaid imposed
(a) on waiting for the purpose of loading or unloading a vehicle.
(b) so as expressly to limit the duration of waiting of vehicles within a particular period,
(c) on waiting where the provisions of such prohibition or restriction exempt the waiting of a vehicle in respect of which a certificate of such exemption
