Ключевые слова: accident, alarm, alert, area, attention, background, barricade, barrier, beware, blocking, border, boundary, business, caution, close, crime, criminal, danger, dangerous, evidence, hazard, hazardous, ideas, industrial, line, mark, murder, office, perimeter, police, prevention, prohibited, protected, protection, restricted, risk, safety, secure, secured, security, sign, teamwork, urban, violence, warning, working, zone,