TRIANGULAR WARNING SIGNS ON MAP TYPE SIGNS (HORIZONTAL AND VERTICAL ARMS)
5.60 Figure 5-35 shows how warning signs are added to the horizontal and vertical route arms of map type signs. Where the sign has a green, blue or brown background a white edge is added to the outside of the triangle.
5.61 The appropriate heights for the triangles (excluding any white edges) are given in Appendix D. The position of the triangle, as shown in figure 5-35, remains the same regardless of the triangle height and width of route symbol.
5.62 A warning sign may include a distance plate to diagram 572. This is designed as a normal sign and then reduced to 80% of its size. Where the border is omitted (i.e. white panel on a green, blue or brown background) the corner radii do not change. These remain at 1.5 sw based on the plate x-height (i.e. 1.2 sw based on the x-height of the main sign).
5.63 It may not always be possible to determine the length of the horizontal route arm in accordance with para 5.6. The dimensions shown will fix the minimum length of the arm. However, where the legend block has a long place name, the arm should be extended as appropriate. The horizontal position of the triangle may be adjusted in this case, provided the dimensions shown in figure 5-35 are treated as minimum values. The arm should not extend beyond the length of the legend block. Where this is likely to occur, the legend block should be moved away from the vertical route arm.
5.64 Where two triangular signs are used to indicate different hazards along the same route they are placed side by side. Where these would normally have different heights (see Appendix D), the larger height should be used for both triangles. When the triangular signs are placed on a vertical route arm, one of the triangles is centred horizontally on the arm as shown in figure 5-36 (see also para 11.16). Any distance plate associated with two hazards that occur at the same location is offset as shown in figure 5-36. Where two triangular signs on the same route arm indicate hazards at different locations, any distance plate should be associated with the appropriate sign. Where this would result in the two triangles being further apart than 6sw, it is strongly recommended that the triangles be omitted from the sign and separate signing used to indicate the hazards. Where the sign indicates a height limit in both imperial and metric units, the warning triangle to diagram 530A should normally be used. However, two separate triangles to diagram 530 are also permitted. The metric sign must always be placed to the right of the imperial sign. A metric sign cannot be used by itself.
5.65 The minimum distance between any triangle orplate and any sign border is 2.5 sw.
5.66 The minimum distance between the top of a triangle on the side arm and any unrelated legend above should be 14sw for a panel, patch or symbol, 12.5sw for a reduced x-height legend ("alternative route" etc, see para 3.37), and 12sw for any legend at the main x-height. (See also para 5.67}}.)
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