Ключевые слова: background, ban, black, blank, caution, circle, city, collection, concept, control, danger, design, empty, forbidden, forbidden sign, frame, graphic, highway, icon, information, law, message, metal, no, object, open, outdoor, panel, park, pole, post, prohibited, prohibition, red, road, roadside, rule, safety, set, sign, signage, stop, street, style, symbol, traffic, transportation, warning, way, white,