Ключевые слова: alert, approach, area, attention, barricade, barrier, beware, block, border, boundary, car, caution, civil engineering, closed, construction, container, danger, direction, dusty, forbidden, ground, heed, hole, industrial, industry, keep out, manufacturing, obstacle, outdoor, prohibition, protection, red, safety, secured, sign, signal, silo, soil, stop, stripes, structure, symbol, terrain, trench, triangle, warn, work in progress, workplace, works, zone,