Ключевые слова: accident, activity, alarm, alert, alphabet, area, attention, authorized, banner, beware, block, caution, construction, copy, crime, danger, dangerous, data, error, hazard, health, industry, information, injury, letter, management, message, notice, police, protect, protection, quote, restricted, risk, safety, secure, security, sign, signal, space, stop, symbol, text, traffic, warning, wood, word, work, zone,