Ключевые слова: attention, background, blue, bright, car, caution, clear, clouds, color, communication, control, crossroad, danger, direction, forbidden, halt, highway, information, intersection, isolated, law, message, metal, nobody, object, octagon, outdoors, pole, post, red, road, roadside, roadsign, safety, sign, signal, sky, speed, stop, street, symbol, text, traffic, transport, transportation, travel, urban, warning, white, word,