Ключевые слова: abstract, access, accident, attention, authority, background, barricade, barrier, business, caution, challenge, closeup, communication, concept, construction, creative, crime, criminal, danger, dangerous, forbidden, idea, industrial, law, line, murder, object, plastic, police, protect, protection, risk, safe, safety, security, sign, site, stop, symbol, tape, text, warning, work, yellow, zone,