Ключевые слова: attention, caution, control, danger, design, direction, drive, driving, empty, flat, give, graphic, highway, icon, illustration, information, isolated, isometric, law, metal, metallic, object, precedence, priority, red, restriction, road, roadsign, rule, safety, sign, signal, signboard, signpost, silhouette, single, stop, street, symbol, traffic, transport, transportation, triangle, triangular, warning, way, white, yield,