Department of Transport, Traffic Signs Manual : Chapter 4… (2013)
“ Reference should always be made to the working drawings (see para 1.8) to determine the correct layout of the different legends.May be used only in combination with diagram 562, or when varied to "Road liable to flooding" with diagram 554. "Accident" may be varied to "Ambulance station", "Blasting", "Blind summit", "Census", "Dust cloud", "Fallen tree”, "Fire station", "Frost damage", "Hidden dip "Overhead cable repairs", "Pedestrians crossing", "Runners in road", "Smoke" or "Walkers in road”. ”
