Introducing the Ultimate Solution in Tactile Walking Surface Indicators (TWSI). Access Tile Replaceable Cast in Place has combined proven engineered polymers, processing and material technologies with innovative and intelligent design features to create the ultimate replaceable tactile walking surface indicators. Maximized efficiencies in manufacturing, materials sourcing and product specifications deliver the most cost-effective solution in the industry. Access Tile truncated dome and wayfinding bar tiles are the industry leader for durability, weather and wear resistance and are available as surface applied tiles and directional bars.