Ключевые слова: background, beautiful, blue, caution, color, communication, control, danger, direction, environment, forest, green, hiking, information, landscape, message, mountain, nature, nobody, object, octagon, outdoors, park, plant, pole, red, road, roadside, safety, signal, signpost, signs, sky, stop, stop sign, street, summer, symbol, text, tourism, traffic, transportation, travel, tree, valley, warning, way, white, word,