Ключевые слова: access, advice, alert, assistance, attention, background, caution, client, communication, concept, control, customer, danger, dangerous, direction, education, forbidden, info, inform, information, law, message, no, object, problem, red, restriction, risk, road, roadsign, safety, security, sign, signal, stop, street, symbol, text, traffic, transport, transportation, warning, way, word,