ada tactile surfaces

[ew7]

i'm working on a project that requires the handicapped ramps use an ada tactile surface. does anyone know where i can find info on this?

 

Here are company on the web:

http://www.armor-tile.com/Tiles.htm

http://www.floorsafety.com.au/tactiles.htm

http://www.vngrd.com

http://www.detectablewarnings.com