4.19 On some stack type signs it may be desirable to show two warning triangles as shown in figure 4-13. Where these would normally have different heights (see ..D/Appendix D), the larger height should be used for both triangles. Where the two hazards occur together, any distance plate should be centred horizontally beneath the two triangles. Where two triangular signs 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 6 stroke widths 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.
REGULATORY SIGNS ON STACK TYPE SIGNS
4.20 The dimensions relating to the various gaps apply equally to plates with and without borders and to triangles with and without white edges. The gap is measured to the outside of any border or edge provided.
REGULATORY SIGNS ON STACK TYPE SIGNS
4.21 Figures 4-14 and 4-15 show how regulatory sign roundels are added to stack type signs. The roundel is always placed on the same side of the legend as the arrow. Where the sign has a green, blue or brown background a white edge is added to the outside of the roundel. The appropriate diameters for the roundels (excluding any white edges) are given in Appendix D. A plate indicating the distance from the junction to the restriction should always be used unless the restriction indicated commences at the junction. The design of the plate is the same as described for distance plates in para 4.16. Where the plate is placed on a green, blue or brown background the border is omitted.
4.22 Where a destination is shown on a panel, the roundel and any plate is also included in that panel.
4.23 Figure 4-15 includes the alternative route message, the design of which is detailed in paras 3.37 and 3.38.
4.24 Two roundels may be shown in a similar manner as described for warning triangles in para 4.19. An example is shown in figure 4-16.
38
