Ключевые слова: 20, abstract, arrow, background, black, blue, car, caution, circle, city, concepts, corner, danger, dangerous, day, drive, england, europe, figure, german, germany, highway, hour, image, information, isolated, law, limit, numbers, post, protection, red, road, rule, safety, sign, sky, slow, speed, street, symbol, traffic, transport, transportation, turn, twenty, urban, warning, white, yellow,