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Purpose: It is reported that there can be considerable gaps due to GPSinaccuracy and mapping errors if blind and visually impaired (BVI) travelersrely on digital maps to go to their desired bus stops. We evaluated the abilityof a mobile app, All_Aboard, to guide BVI travelers precisely to the bus-stops.Methods: The All_Aboard app detected bus-stop signs in real-time via smartphonecamera using a neural network model, and provided distance coded audio feedbackto help localize the detected sign. BVI individuals used the All_Aboard andGoogle Maps app to localize 10 bus-stop locations in Boston downtown andanother 10 in a sub-urban area. For each bus stop, the subjects used the appsto navigate as close as possible to the physical bus-stop sign, starting from30 to 50 meters away. The outcome measures were success rate and gap distancebetween the app-indicated location and the actual physical location of the busstop. Results: The study was conducted with 24 legally blind participants (meanage [SD]: 51[14] years; 11 (46%) Female). The success rate of the All_Aboardapp (91%) was significantly higher than the Google Maps (52%, p<0.001). The gapdistance when using the All_Aboard app was significantly lower (mean [95%CI]:1.8 [1.2-2.3] meters) compared to the Google Maps (7 [6.5-7.5] meters;p<0.001). Conclusion: The All_Aboard app localizes bus stops more accuratelyand reliably than GPS-based smartphone navigation options in real-worldenvironments.

Field evaluation of a mobile app for assisting blind and visually impaired travelers to find bus stops