5.67 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 MAP TYPE SIGNS (HORIZONTAL AND VERTICAL ARMS)
5.68 Figure 5-37 illustrates the design of the sign shown in diagram 2108. In addition to the regulatory roundel, it demonstrates the use of the "alternative route" message. A plate indicating the distance from the junction to the restriction should always be used unless the restriction indicated commences at the junction. The gap of 2 sw immediately above the tip of the forward route arm is reduced to 0.5sw when the arm is vertical or within 15° of the vertical (i.e. the gap is 0.5sw greater than the standard gap-see paras 3.37, 5.3, 5.8, 5.10 and 5.73).
5.69 Regulatory signs with supplementary plates to diagrams 572, 618.1 or 953.2, or without such plates, may be added to vertical route arms in a manner similar to triangular warning signs. The design of the plates is the same as for those used with warning triangles (see para 5.62). Examples are illustrated in figure #fig5-38.
5.70 Where a regulatory sign with a red roundel is placed on a green, blue or brown background, a white edge 0.5sw wide is added, similar to the white edge on the triangular warning sign. Certain
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