Ключевые слова: accident, alert, area, asbestos, attention, barrier, careful, caution, closed, construction, damage, danger, dangerous, dangers, dutch, europe, fence, forbidden, hazard, icon, industry, information, keep, nobody, precaution, prevention, prohibited, prohibition, protect, protection, restrict, restricted, risk of accident, safety, security, sign, sign board, signage, signal, signpost, slide, slip, stop, symbol, trespassing, warning, work, yellow, zone,