Ключевые слова: all, attention, background, beware, boarding, brown, building, business, caution, construction, corrugated, danger, dangerous, door, entrance, exclamation, gate, hazard, icon, information, isolated, label, locked, mark, metal, notice, people, protection, risk, road, road sign, safety, secure, security, sign, stop, street, times, traffic, warning, white, wood, workers, workplace,