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Accessible pedestrian signal (APS) was proposed as a mean to achieve the samelevel of service that is set forth by the American with Disability Act (ADA)for the visually impaired. One of the major issues of existing APSs is thefailure to deliver adequate crossing information for the visually impaired.This paper presents a mobile-based APS application, namely Virtual Guide Dog(VGD). Integrating intersection information and onboard sensors (e.g., GPS,compass, accelerometer, and gyroscope sensor) of modern smartphones, the VGDapplication can notify the visually impaired: 1) the close proximity of anintersection and 2) the street information for crossing. By employing a screentapping interface, VGD can remotely place a pedestrian crossing call to thecontroller, without the need of using a push button. In addition, VGD informsVIs the start of a crossing phase by using text-to-speech technology. Theproof-of-concept test shows that VGD keeps the users informed about theremaining distance as their approaching the intersection. It was also foundthat the GPS-only mode is accompanied by greater distance deviation compared tothe mode jointly operating with both GPS and cellular positioning.

Virtual Guide Dog: Next Generation Pedestrian Signal for the Visually Impaired