How do you warn a blind person of danger visible to the sighted? What about combination headset/RFID tag that broadcasts in a short radius the presence of someone for whom visual cues are ineffective? We then install RFID receivers and audio transmitters in key locations: when they detect (via RFID) the presence of a blind person, they transmit the appropriate warning over radio or some other appropriate frequency. The individual's headset picks up the signal and relays the cue aurally. Perhaps there could also be some triangulation and proximity possibilities as well. (Stereo headphones?)
This would seem to be a much better system than Braille warnings that count on a person happening to put their hands in a particular spot. Indeed, the normal operation of Braille in public places seems to be based on the presumption of sight to be able to locate the contextual "hotspot."
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