Ключевые слова: attention, background, blue, border, car, caution, clear, cloud, clouds, communication, danger, direction, driving, environment, forbidden, freeway, highway, information, isolated, landscape, low, message, metal, nobody, object, octagon, outdoors, pole, prohibited, red, road, roadside, rural, safety, sign, signal, single, sky, speed, stop, street, symbol, text, traffic, transport, transportation, travel, warning, way, white,