Doug Shupe with AAA Texas says they looked at crash data from 16 and 17 year old drivers.
"What this study found was that the likelihood of a 16 or 17-year-old driver being killed in a crash, per mile driven, increases with each additional young passenger that's in the vehicle."
So with one other young passenger, the risk of a fatal crash goes up by 44 percent. The risk doubles with two passengers and quadruples when three or more passengers are in the car.
"This time of year is especially important to talk with teens about this study, but also about driving safely in general. As summer approaches, many teens will be out of school and they could end up riding around with other teens who are not as experienced behind the wheel."
Although teens are at greater risk when driving with other teens, the study shows the risk of a fatality decreases by 62 percent if an adult over the age of 35 is in the vehicle. Shupe says parents should spend more time as a passenger in the car and help their teen gain good driving experience.