Ключевые слова: america, arrow, attention, background, beware, black, caution, city, direction, do, enter, isolated, law, left, letter, limit, metal, no, not, notice, one, oneway, outside, paint, post, prohibit, red, regulation, right, road, round, rule, safety, sign, signal, signs, stop, street, symbol, text, traffic, transportation, usa, warn, warning, way, white, word, yellow,