Ключевые слова: alone, background, black jacket, building, check, checkpoint, city, colorful background, construction, construction area, construction material, crowd, dark skin, downtown, fence, guard, guarding, human monitoring, jacket, lean, leaning, male, man, materials, metal, metallic, monitoring, one person, person, prevention, rail, railing, reassure, responsibility, responsible, risk, safe, safety, secure, securing, security, security worker, short hair, sunny, surround, town, uniform, watch, watch over, workplace,