Ключевые слова: alert, background, blind, blindness, block, braille, circle, closeup, concrete, design, detectable, domes, dot, emboss, floor, footpath, ground, handicap, hazard, help, indicators, irregular, isolated, line, low, object, outdoor, pattern, pavement, paving, pedestrian, platform, railway, road, station, street, surface, symbol, tactile, texture, tile, truncated, walk, walkway, wall, warning, way, white, yellow,