(b) when the signs shown in diagrams 606, 609 to fill and 616 are mounted in a bollard fitted with a means or lighting them internally, they shall be illuminated throughout the hours of darkness by that means of internal lighting;
(c) without prejudice to the next following sub-paragraph, if a sign specified in sub-paragraph (a) above when not so fixed, or a sign specified in sub paragraph (b) above when not so mounted, or any other sign to which this paragraph applies is erected on a road within 50 metres of any lamp lit by electricity which forms pair or a system of street-lighting furnished by means of at least three such lamps planed not more than 183 metres apart, that sign shall be illuminated by a means or internal or external lighting either for so long as the said system is illuminated, or throughout the hours of darkness, unless it is erected temporarily for any of the following reasons—
(i)for the purpose of a temporary statutory provision,
(ii)by reason of some emergency, or,
(iii)if that road is a road subject to a speed limit of 30 m.p.h or under by reason of the execution of works, or of any obstruction on the road;
(d) any sign to which this paragraph applies and is either not so fixed as provided in sub-paragraph (a) or is erected in such a manner that it is nor illuminated regularly throughout the hours of darkness by a means of internal or external lighting, shall be illuminated by the use of reflecting material in accordance with the provisions of Regulation 18(3) and (4).
(3) Subject to the provisions of paragraph (7), this paragraph applies to any sign shown in diagrams 501, 504.1 to 510, 512, 513, 516, 517, 520 to 524.1, 528 to 532.1, 533, 537, 538, 543, 544 to 544.2, 555, 556, 564, 564.5 to 556, 567.2, 569.2, 569.3, 601.1, 602, 626.1, 628.1 to 632, 642 (if the diameter of that sign is more than 450 millimetres), 649.1, 652 to 654, 701 to 712.1, 714, 718.2, 715.3, 727.2, 818 to 819.2, 837.1 to 833.2, 858 to 858.2, 901.1 to 911, 915 to 916.1, 918.1 and 919.1 in construing the following sub-paragraphs—
(a) without prejudice to the next following sub-paragraph, if a sign to which this paragraph applies is erected on a road within 5 metres or any such lamp as is descried in sub-paragraph (c) of paragraph (2) that sign shall be illuminated by a means of internal or external lighting as is therein provided unless it is erected temporarily for such a reason as in therein specified;
(b) any sign to which this paragraph applies which is erected in such a manner that it is not illuminated regularly throughout the hours of darkness by a means of internal or external lighting, shall be illuminated by the use reflecting material as provided by paragraph (2)(d)
(4) Any sign shown in diagrams 515, 539 to 542.2, 545, 548 to 552, 554, 554.1, 557 to 559, 562, 569, 569.1, 569.4, 574, 577, 575, 580, 633 to 635, 642 (if the diameter of that sign is 450 millimetres or less), 646, 647, 655, 713, 715 to 718.1, 719 to 727, 728 to 737.1, 746.2, 754 to 757, 760, 761, 801, 806 to 806.3, 808.1, 808.3, 811 to 812.2, 819.3 to 825, 827, 828.2, 830 to 832.2, 838.3, 838.4, 854 to 856, 861 to 863, 912, 917, 920 and 925 may be illuminated by a means of internal or external lighting, but if not so illuminated throughout the hours of darkness, shall be illuminated by the use of reflecting material in accordance with the provisions or Regulation 15(3) and (4).
