Ключевые слова: attention, background, blank, blue, board, caution, circle, color, copyspace, empty, forbidden, guide, horizon, icon, information, isolated, message, metal, nature, no, notice, object, ocean, outdoor, panel, pet, pole, post, prohibited, prohibition, red, road, safety, sea, ships, sign, signage, signboard, signpost, signs, sky, space, street, symbol, warning, way, yellow,