Ключевые слова: attention, background, blue, border, car, caution, clear, clouds, communication, crossing, danger, design, direction, forbidden, freeway, grass, green, highway, information, landscape, message, metal, navigation, nobody, object, octagon, outdoors, pole, prohibited, railway, red, road, roadside, rural, safety, sign, signal, single, sky, speed, stop, stop sign, street, symbol, text, traffic, traffic sign, transportation, travel, warning,