Ключевые слова: 20, abstract, auto, background, black, blue, circle, concept, concepts, conceptual, danger, dark, drive, highway, horizontal, hour, icon, image, industrial, information, law, limit, miles, number, numbers, paint, park, post, red, road, rough, round, safety, shape, sign, sky, space, speed, street, symbol, text, texture, traffic, transportation, travel, twenty, warning, way, white,