Regulation 7 Keep right sign
A keep right sign shall consist of a device which is—
(a)
of the colour and type of the traffic sign shown in diagram 610 in Schedule 2 to the 1997 Regulations varied so that the arrow points downwards to the right;
(b)
of the size shown in that diagram except that its minimum diameter shall be 900 millimetres instead of 270 millimetres; and
(c)
illuminated in accordance with the provisions in column (3) of item 1 of Schedule 17 to the 1997 Regulations.