I don't know if they have been invented or applied to city sidewalks yet, however the thought occurred to me that if sensors were placed in sidewalks indicating safe walking paths so blind people could follow them easily; perhaps with the cane that detect the signal; from the sensor-emitters, navigating streets for trhe blind might be easier.
I saw someone walking today with a cane for the blind doing things the old fashioned way. Maybe magnetic pieces injected into concrete would work, It would be even better if magnets were made to send two fields in a sensor and one for going another direction. I am not aware of what other sort of very durable signal emitter could be made that could be detected by a cane and is very cheap so millions could be placed around cities. If a signal could be made by digitaling a shaped magnetic field that tech might be useful .It is topic to think about.
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