Ключевые слова: alert, america, attention, blue, bright, car, caution, danger, design, direction, do, drive, driving, enter, entrance, entry, forbidden, green, highway, horizontal, icon, information, interstate, law, message, nature, no, not, one, post, red, road, roadsign, rules, safety, sign, signage, sky, stop, street, symbol, traffic, transportation, travel, usa, warning, way, white, wrong,