Ключевые слова: barbed, barrier, below, bridge, camera, cctv, concrete, construction, control, crisis, detection, electronic, equipment, fence, fencing, forbidden, guard, industry, measures, metal, monitoring, obstacle, outdoor, perimeter, pole, precautions, protect, protection, rack, safety, secure, security, spiral, street, structure, support, surveillance, system, technology, thorn, urban, video, view, wire, zone,