Smart phone based phubbing walking detection and safety warning

As the increasing popularity of smart phones, the phenomenon phubbing (phone and snubbing) walking, a distracted walking behavior much like conventional addictions, poses a rising concern on pedestrian safety. As reported, the typical American checks his or her smart-phone once every six-and-a-half minutes, or 150 times daily. By Liberty Mutual Insurance, it is found that 60 percent of people surveyed said they often drafted emails or updated their Facebook status on the move, even though 70 percent knew full well the risks of striding into oncoming traffic unawares.