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Recent advancements in mobile technology allow Global Positioning System (GPS)-enabled cell phones provide a variety of real-time location-based services (LBS). This paper reports on the design, implementation, and testing of such a service, the Travel Assistant Device (TAD), that aids transit riders with special needs to use public transportation. TAD is a program that provides the rider with customized real-time audio, visual, and tactile prompts for when they should exit the transit vehicledoi:10.1049/iet-its.2009.0028 fatcat:psjlqmwdjnaohkdf6ismcp6w6q