Ключевые слова: access, alert, area, attention, background, barrier, blue, car, caution, circle, city, closeup, concept, danger, design, direction, enter, entrance, entry, forbidden, icon, illustration, isolated, metal, no, object, one, prohibited, prohibition, red, restricted, restriction, road, roadsign, rule, safety, sign, signal, sky, stop, street, symbol, traffic, transport, transportation, urban, warning, way, white,