tactile paving as a system of textured ground surface indicators

aid alert approaching art asphalt assist bars brick brickwork buildings cane carving cause circle community cones design detectable disagreement distinctive domes floor flooring font footpath found grade ground hazard hazardous impaired indicators inside installing iron line long may number pathway pattern pavement paving pedestrian pedestrians platforms provide public railway roadsides sidewalk stairs station streets surface system tactile textured tile tripping truncated underfoot used user vision vision-impaired wall warnings window wood yellow