Things have changed a bit since this was invented in the '60s. How about a virtual variation? Embed low power transmitters, e.g. RFID, in the places where you'd put tactile pavement. Visually impaired people can carry a phone that receives the signal and renders them as audio.

This can be far cheaper than tactile pavement and so more widely deployed, more easily updated as the environment changes, and present different warnings to people with different needs ... like people with limited mobility ("warning 5 inch step down in 3 feet") or the unimpaired ("please do not run in this corridor").

With sufficiently accurate location data and ubiquitous networking, the transmitter isn't needed at all. Apps could curate warnings and other location specific info, and you could subscribe to the ones that are relevant to you. If location tech isn't up to the sub-meter resolution, the embedded transmitters could be used to just send their own exact location. Then you feed that to the app to return warnings, etc.

The etc. could include hyper-local ads, making the system self funding.