Radio frequency identification beacon for use with label on white cane used by blind/partially sighted person for safe crossing of street, has digital processor coupled with receiver and sound messages storage unit to control transmitter
M. Banâtre, P. Couderc, J. Pauty, and M. Becus. Mobile Human-Computer Interaction – MobileHCI 2004, volume 3160 of Lecture Notes in Computer Science, Springer, Berlin / Heidelberg, (2004)
S. Harper, C. Goble, and S. Pettitt. Proceedings of the 10th International Conference on Human-Computer Interaction, 4, page 399--403. London, UK, Lawrence Erlbaum Associates, (2003)