Ключевые слова: abstract, accident, advice, allowed, auto, background, banner, blank, blue, border, car, circle, cloud, color, danger, design, direction, forbid, forbidden, frame, graphic, help, highway, icon, idea, illustration, information, inhibition, interdict, isolated, medium, metal, nature, prohibition, red, road, round, safety, showing, sign, signal, sky, symbol, technology, texture, traffic, transportation, travel, warning, white,