Improving Public Transit Usability for Blind and Deaf-Blind People by Connecting a Braille Display to a Smartphone
Shiri Azenkot, Emily Fortuna · 2010 · Proceedings of the 12th International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS 2010) · doi:10.1145/1878803.1878890
Summary
This short paper explores the public transit challenges faced by blind and deaf-blind people and presents MoBraille, a novel framework that connects any Wi-Fi-enabled Braille display to an Android smartphone. The authors conducted semi-structured interviews with four blind and four deaf-blind adults in Seattle to understand how they currently use public transit. The research identified three key challenges for blind riders: locating a bus stop (stops are inconsistently located relative to intersections, and participants search for landmarks like shelters or poles), boarding the correct bus (stressful when multiple buses arrive simultaneously), and knowing when to disembark on unfamiliar routes. Deaf-blind participants faced similar challenges but with the added difficulty of being unable to ask others for verbal information, relying instead on pre-printed cards that bus drivers used to recognize them and announce their stop. All deaf-blind participants preferred Braille over text-to-speech (TTS) for accessing digital information, noting that TTS is distracting, draws unwanted attention, and frequently mispronounces words like street names.
Key findings
The MoBraille framework enables Braille displays to access Android phone features — including GPS, compass, 3G network connectivity, and third-party applications — through a Wi-Fi connection using standard HTTP requests, eliminating the need for proprietary device-specific protocols. The authors built a transit tool on MoBraille that uses GPS and compass to identify the current bus stop, queries the OneBusAway API for real-time arrival information, and displays it on the Braille display. A participatory design session with a deaf-blind user revealed three critical design principles: short output messages are essential because the participant's reading speed was slow (several minutes per paragraph); short input messages using numbers rather than text were faster and easier; and conciseness with training is more important than discoverability — the user preferred memorizing terse formats like "44 Downtown: 4m" over self-explanatory but verbose messages. The participant also preferred being trained by an interpreter rather than reading self-explanatory interfaces.
Relevance
This paper highlights how deaf-blind users are underserved by mainstream mobile accessibility solutions that rely on speech output. While smartphone screen readers have dramatically improved mobile access for blind users, deaf-blind people who rely on Braille displays are often left behind because Braille connectivity typically requires proprietary protocols specific to each display manufacturer. MoBraille's device-agnostic approach using standard web technologies (HTTP, HTML) is an elegant solution that lowers the development barrier for Braille-accessible applications. The participatory design findings are particularly valuable: the preference for brevity over discoverability challenges common UX assumptions about self-explanatory interfaces, and the need for interpreter-mediated training rather than on-screen instructions reflects the unique interaction constraints of deaf-blind users. For transit agencies and app developers, the work underscores that real-time arrival information is critical for independent travel, but must be delivered in formats beyond speech to serve the full spectrum of users with sensory disabilities.
Tags: deafblindness · blindness · braille display · public transit accessibility · mobile accessibility · participatory design · assistive technology · navigation