Most seriuos accidents with teen drivers are caused by distractions, like phones:
Researchers analyzed the six seconds leading up to a crash in nearly 1,700 videos of teen drivers taken from in-vehicle event recorders. The results showed that distraction was a factor in 58 percent of all crashes studied, including 89 percent of road-departure crashes and 76 percent of rear-end crashes. NHTSA previously has estimated that distraction is a factor in only 14 percent of all teen driver crashes.
Researchers found that drivers manipulating their cell phone (includes calling, texting or other uses), had their eyes off the road for an average of 4.1 out of the final six seconds leading up to a crash. The researchers also measured reaction times in rear-end crashes and found that teen drivers using a cell phone failed to react more than half of the time before the impact, meaning they crashed without braking or steering.