Ключевые слова: activity, adult, architect, building, building contractor, bulldozer, caucasian ethnicity, coal, construction equipment, construction industry, construction machinery, construction site, construction worker, crane, development, digging, dirt, earth mover, engineer, engineering, equipment, foreman, forklift, fuel and power generation, hardhat, helmet, industry, machinery, males, manager, men, miner, mining, nature, occupation, one person, outdoors, professional occupation, protective workwear, rear view, reflective clothing, road construction, safety, teamwork, work helmet, worker, working, yellow,