Ключевые слова: alert, assist, background, blind, block, button, circle, city, concrete, design, detectable, direction, dirty, dot, emboss, floor, footpath, ground, hazard, help, indicators, irregular, line, low, modern, object, outdoor, pattern, paving, platform, sidewalk, sign, surface, tactile, texture, tile, tiles, truncated, urban, walk, walkway, wall, warning, way, yellow,