incorporated in the signs shown in the diagrams in Schedule 1 shall have the proportions and form shown in Part IV or Part VIII of Schedule 5.
(2) Letters and numerals used for the purposes of indicating a route number on the sign shown in diagram 738 and on any sign shown in a diagram in Part V of Schedule 1 shall have the proportions and form shown in Part IX of Schedule 5.
(3) Any arrow to be used in a sign shown in diagram 908 and any other sign of a directional nature shown in a diagram in Schedule 1 which is mounted over the carriageway shall have the proportion and form of the arrow secondly shown in Part IV or Part VIII in Schedule 5.
15.—(1) The provisions of the following paragraphs of this Regulation in their application to the signs shown in diagrams 521, 606, 609, 612 to 614, 616 and 809 are subject to the provisions of Regulation 16.
(2) The signs shown in diagrams 612 to 614–
(a) when fixed to light signals as prescribed by Regulation 31 or by Regulation 31 as varied by Regulation 32 shall be illuminated at all times by a means of internal lighting, and
(b) when not so fixed shall be illuminated throughout the hours of darkness by a means of internal or external lighting unless the signs are placed only temporarily on a road for the purposes of a temporary statutory provision or by reason of the execution of works or any obstruction on a road or some emergency.
(3) The sign shown in diagram 606
(a) when fixed to light signals mentioned in the last paragraph shall be illuminated at all times by a means of internal lighting,
(b) when mounted in a bollard shall be illuminated throughout the hours of darkness by a means of internal or external lighting, and
(c) when not fixed or mounted as aforesaid, but when erected on a road within 50 yards of a street lamp lit by electricity shall be illuminated throughout the hours of darkness by a means of internal or external lighting unless the sign is placed only temporarily on the road for the purposes of a temporary statutory provision or by reason of the execution of works or any obstruction on a road or some emergency.
(4) The signs shown in diagrams 609 to 611, and 616
(a) when mounted in a bollard shall be illuminated throughout the hours of darkness by a means of internal or external lighting, and
(b) when not mounted as aforesaid, but when erected on a road within 50 yards of a street lamp lit by electricity shall be illuminated throughout the hours of darkness by a means of internal or external lighting unless the signs are placed only temporarily on the road for the purposes of a temporary statutory provision or by reason of the execution of works or any obstruction on a road or some emergency.
(5) The signs shown in diagrams 521 and 809 when erected on a road within 50 yards of a street lamp lit by electricity shall be illuminated throughout the hours of darkness by a means of internal or external lighting unless in the case of the sign shown in diagram 521 it is placed only temporarily on the road for the purposes of a temporary statutory provision or by reason of the execution of works or any obstruction on a road or some emergency.
(6) The sign shown in diagram 814 shall be illuminated throughout the hours of darkness by a means of internal or external lighting.
