Police say three teens, including the 13-year-old driver, are in hospital after a crash on the QEW.
It happened just before 5:00 a.m. Saturday morning.
Police say a 14 year-old passenger is in critical condition at a trauma centre in Hamilton and a 16-year-old passenger suffered serious injuries.
The 13-year-old driver has minor injuries.
The SUV was travelling southbound on Eighth Line when the driver apparently lost control, just before the intersection of North Service Road. It then plowed through a chain-link fence and struck a concrete median on the westbound lanes of the QEW.
No other vehicles were hit.
Investigators believe the driver's inexperience, along with speed, were contributing factors in the crash.
They say no charges have been laid against the driver, but they are still investigating the collision.