a beside veiw of a cranes minicar for wiring communication lines with a wooden stairs

vehicle iron transport machine mast aviation industry military wheel engine aircraft factory asphalt weapon locomotive car veiw cranes minicar wiring communication lines wooden stairs architecture automobile back background building business car caution communication construction cranes danger dangerous design engineering fast highway industrial industry metal road safety security sign signal site situation speed steel street structure subway subway symbol technology traffic transport transportation truck trunk vehicle warning warning signs weight wheel white wiring stairs work