(2) traffic sign board with reflective film material, highway, the highway should adopt a secondary reflective film, two, three highway traffic signs should adopt three, four reflective film, four roads should be adopted four, five reflective film.
(3) the door frame, cantilever-type classes such as dangling traffic signs, informative traffic signs should be adopted level higher than the road side of the reflective film.
(4) to ensure the uniformity and conditions permit, the lighting or light-emitting diodes can be used to increase the visible effect of vital signs.
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