Cars Talk to Phones: A DSRC Based Vehicle-Pedestrian Safety System

The prevalence of smartphones presents a unique opportunity to develop a system that can have a significant impact on reducing the annual 400,000 fatalities from pedestrian traffic accidents. This system gives 360 degrees, extended range, NLOS view where both the driver and the pedestrian are warned of a possible collision. This, the first of its kind, system was developed from a two year collaborative research effort between Honda and Qualcomm to leverage DSRC so vehicles can communicate with smartphones to preempt a possible collision between a pedestrian (with a smartphone) and an approaching vehicle. This paper describes the pedestrian and vehicle-based algorithms and gives an overview of how this system warns both the driver and the pedestrian so they can take evasive action and prevent a collision. We present the results from our field tests where we demonstrate several pedestrian safety scenarios and present the over- the-air performance data collected in the field tests. Finally, we discuss remaining challenges and present possible approaches to reducing false positives, minimizing spectrum and channel congestion and improving security and localization.