Ключевые слова: accident, alert, attention, background, beware, black, careful, caution, cleaner, cleaning sign, danger, dangerous, fall, falling down, floor, graphic, hazard, hazardous, human, illustration, information, isolated, label, notice, precaution, prevention, public, risk, road, safety, security, sign, signage, skid, slide, slip, slippery, step, sticker, surface, symbol, tiled, triangle, warn, warning yellow sign, water, wet, white, yellow,