Ключевые слова: advice, advisory, alert, area, attention, background, ban, blue, board, clean, communicate, decision, disallow, displayed, earth, ecology, environment, forbidden, garbage, green, illegal, information, instruction, litter, marker, metal, modern, no, nobody, notice, outdoors, outlawed, outside, prohibit, protect, regulation, reminder, restricted, rule, rural, sign, signage, space, street, symbol, trash, warning, white, writing, zone,