Ключевые слова: area, background, beware, black, blue, business, care, caution, color, concept, construction, cross, danger, dirty, first, floor, gray, ground, grunge, guide, health, horizontal, industrial, label, line, mark, message, old, paint, river, road, rough, safe, safety, security, sign, space, street, strip, surface, symbol, text, texture, transportation, warning, white, work, worker, yellow, zone,