5.78 Figures 5-40 and 5-41 show triangular warning signs added to route arms inclined at 45° and 60° above the horizontal respectively. Figure 5-42 shows other examples of inclined arms, including those with two triangles.
5.79 Single regulatory signs without plates will generally fit without complication into a route arm inclined at any angle. The roundel should be no closer than 4sw to any vertical route arm. Figures 5-43 and 5-44 show various layouts for single and twin roundels with plates. In the case of the single roundel on a 30° arm, the plate should be placed as close to the roundel as possible without going below the minimum dimensions shown. Design details shown in figure 5-42 for the single triangular sign with the “2 miles” plate also apply to roundels in a similar situation.
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