Ключевые слова: background, barrier, beware, black, blank, board, border, boundary, care, caution, chain, chainlink, construction, copy, danger, empty, fence, forbidden, freedom, grunge, hanging, hazard, industry, link, mesh, message, metal, no, notice, plaque, plate, prison, prohibited, protection, risk, rusty, safety, security, sign, site, space, striped, symbol, trespassing, under, urban, warning, wire, yellow, zone,