Ключевые слова: ahead, alert, attention, beware, blank, blue, careful, caution, concept, control, copy, copyspace, danger, dangerous, empty, filter, forbidden, hazard, information, notice, precaution, prohibited, protected, protection, red, regulation, restriction, retro, risk, road, roadsign, safe, safety, sign, signage, signboard, signpost, sky, space, symbol, text, transport, triangle, triangular, urban, vintage, warn, white,