According to the study by the Pew Research Center, half of U.S. teens with cell phones admit talking on them while driving and a third say they've written text messages while they were at the wheel.

The report released today, "Teens and Distracted Driving: Talking, texting and other uses of the cell phone behind the wheel," also says:

- 75 percent of teens have a cell phone, and more than half of them say they have talked on their cell phone while driving.

- 40 percent say they have been in a car when the driver used a cell phone "in a way that put themselves or others in danger."

- 48 percent of teens say they have been in a car when the driver was texting.

- More than one-third of teens ages 16 or 17 who text say that have texted while driving.