Ключевые слова: accident, alarm, alert, alertness, area, attention, barricade, barrier, beware, blocking, careful, caution, caution sign, cordon tape, danger, dangerous, do not enter, hazard, hazardous, hazzard, information, information symbol, law, maintenance, precaution, prevent, prevention, problems, prohibit, prohibited, prohibition, restricted, restriction, risk, risk management, safe, safety, secured, security, service, sign, signal, stop, unsafe, warning, warning sign, warning symbol,