It's a shocking reality: using a cell phone of any kind (even with a headset!) while driving impairs your reaction time as much as having a blood alcohol level at the legal limit of .08, according to a University of Utah study. And nearly one in five car accidents can be attributed to distracted driving. But besides tossing your phone in the back seat, what can you do to steer clear of the temptation of calls, texts or tweets at a red light—or help your teens do the same? Sprint launched an app yesterday called "Drive First" that automatically locks the phone when the car's speed exceeds 10 miles per hour. All calls and text conversations will be forced to end and the phone will be locked on the home screen, customized by the account holder (this can include just a 911 button or specific apps that the user deems necessary, such as weather and music). After the car stops moving for a few minutes, it fully unlocks. Considering many of us (myself included!) have a massive multitasking habit, this app could be a lifesaver. Drive First is now available for Sprint android phones for $2 per month and in the near future, Blackberry and other phone users will be able to use the app as well. Learn more and sign up for a free trial or the app here. Now tell us: What are your top safe driving tips?