Ключевые слова: architecture, background, climb, cold, concept, concrete, covered, danger, extreme weather, freeze, fresh, frost, frozen, ice, nature, outdoor, overcast, pedestrian, problem, season, sidewalk, slide, slippery, snow, snowfall, stair, stair climbing, stair railing, staircase, stairway, step, stone, stone stairs, urban, weather, white, winter, wintertime,