Travel Assistant Device (TAD)

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The Travel Assistant Device (TAD) mobile application grew out of a research project conducted at the University of South Florida’s National Center for Transit Research [1] [2]. The travel assistance system for sight-impaired or intellectually-disabled passengers allows them to plan a transit trip and download information to a GPS-enabled mobile phone with the TAD mobile app installed. Phones with the application installed give audio and vibrating alerts when it is time for the passenger to pull the stop cord and alight from the bus.

The TAD system uses GTFS data to import up-to-date schedule and stop. The product is being commercialized by DAJUTA [3], a Florida-based company. Updates on the TAD project can be found at the USF TAD website [4].


  1. S. J. Barbeau, P. L. Winters, N. L. Georggi, M. A. Labrador, and R. Perez (2010), "Travel assistance device: utilising global positioning system-enabled mobile phones to aid transit riders with special needs," Intelligent Transport Systems, IET, Vol. 4 pp. 12-23.
  2. Sean J. Barbeau, Nevine L. Georggi, and Philip L. Winters (2010), "Global Positioning System Integrated with Personalized Real-Time Transit Information from Automatic Vehicle Location," Transportation Research Record: Journal of the Transportation Research Board, pp. 168-176.
  3. DAJUTA. "TAD - Travel Assistance Mobile App." Accessed August 1, 2012 from
  4. University of South Florida Center for Urban Transportation Research. "Travel Assistance Device (TAD)." Accessed August 1, 2012 from