Ключевые слова: abstract, accident, advice, aid, auto, background, banner, blank, blue, border, cloud, color, danger, data, design, direction, frame, graphic, help, highway, horizontal, icon, idea, information, isolated, medium, metal, nature, outdoors, protection, red, road, safety, showing, sign, signal, single, sky, street, symbol, technology, texture, traffic, transportation, travel, triangle, warning, white,