Nearly a quarter of high school freshman, sophomores and juniors have driven without a license. That's according to researchers at Children's Hospital of Philadelphia.
Their data also found unlicensed teenage drivers were less likely to wear seatbelts, and more likely to drive after drinking alcohol and be involved in fatal car crashes.
Nearly thirty percent had taken driver's education classes and half said their parents helped them learn to drive.
Most of the unlicensed teens lived in rural areas or central city districts.