Ключевые слова: air, attention, blue, caution, charge, circle, decibel, emergency, equipment, forbidden, front, hear, horn, icon, illustration, information, isolated, klaxon, law, loud, metal, no, noise, peaceful, public, red, road, safe, safety, shadows, ship, sign, signal, silence, single, sky, smoking, sound, speaker, squeeze, stop, street, strong, symbol, traffic, view, volume, white, zone,