Tactile Ground Surface Indicators (TGSI) have been introduced to the market for some time now due the the ever increasing need for hazard identification.

They are usually installed were a change in the surface is to occur like a stairway, ramp, pedestrian crossing, train station platform etc.
Tactiles now come in many versions from ceramic, pvc and metal and can be set into a slab, stuck on top of a surface or mechanically fixed.