Ключевые слова: access, allowed, area, background, beware, board, build, builder, building, button, caution, construct, construction, craft, danger, denied, forbidden, icon, illustration, industry, infrastructures, label, maintenance, man, no, outside, paving, plant, problem, prohibited, protection, reconstruction, red, road, safety, security, service, sign, site, staff, stop, street, symbol, under, warning, work, worker,