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초록

Transportation accessibility is essential for wheelchair users, as systemic barriers often hinder basic psychological needs including autonomy, competence, and relatedness. Our formative study revealed substantial dissatisfaction with wheelchair-accessible taxi services in Seoul due to unreliable dispatch time predictions. To investigate how information accuracy affects psychological needs and technology acceptance, we developed Greum, a prototype providing reliable dispatch time estimates. Using an extended Technology Acceptance Model, we evaluated the prototype with 41 wheelchair users. Results show that prediction accuracy significantly influences psychological needs, with autonomy emerging as the sole mediator driving perceived usefulness, ease of use, and usage continuance intentions. Together, these findings position information accuracy not merely as a usability concern, but as a prerequisite for autonomy in accessibility-oriented systems.

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