Ключевые слова: aid, alert, attention, background, banner, beware, care, careful, caution, concept, construction, danger, dangerous, design, emergency, engineering, equipment, factory, first, graphic, health, help, icon, illustration, industrial, isolated, job, label, message, protect, protection, risk, road, safe, safety, safety first, secure, security, shape, sign, street, symbol, technology, traffic, warn, warning, white, work, yellow,