Size, colour and type of patrol sign
3.—(1) A patrol sign shall comprise a roundel and a pole on which the roundel is mounted.
(2) The roundel shall be not less than 450 nor more than 470 millimetres in diameter and each of its faces shall be of the size, colour and type shown in the Schedule to these Regulations.
(3) A protective non-retroreflecting red strip, in these Regulations called a “perimeter strip”, may be applied to the perimeter of the roundel in accordance with the requirements of paragraph (4) below.
(4) The requirements are that–
(a)the perimeter strip shall not be retroreflecting;
(b)the perimeter strip shall be either coloured red or uncoloured and transparent;
(c)the part of the red border of the roundel not covered by the perimeter strip shall be at least 40 millimetres wide;
(d)the overall width of the red border together with the perimeter strip shall not exceed 50 millimetres; and
(e)the diameter of the part of the roundel coloured black and yellow shall not be less than 360 millimetres.
(5) The pole shall be coloured with alternating black and yellow bands of equal size and not less than 285 nor more than 315 millimetres deep and with a black band uppermost below the roundel.