Ключевые слова: alert, attention, barrier, beware, bound, boundary, careful, caution, close, concept, concrete, cone, construction, control, danger, drive, equipment, floor, funnel, gray, ground, highway, lane, line, object, orange, protection, road, rubber, rural, safety, security, sign, site, standing, street, stripe, symbol, traffic, transit, urban, vehicle, warning, way, white, work,