According to a new study from Carnegie Mellon University, even if you've put aside your cell phone for a hands-free device while you drive, you aren't necessarily risk free.
Researchers studied the brains of people listening on the phone while they used a driving simulator. They found that those drivers had more trouble staying in their lane and were more likely to hit a guardrail or cross the middle line.
The study shows, they say, that hands-free or voice-activated devices may not be enough to get rid of distractions when it comes to cell phones behind the wheel.