Ключевые слова: 20, attention, background, blue, caution, city, color, control, day, design, drive, driving, end, information, law, limited, metal, nobody, object, outdoors, outside, pillar, pole, public, regulation, regulatory, road, round, rule, shape, sign, signpost, sky, space, speed, steel, street, sunny, symbol, traffic, transportation, tree, white, zone,