Police have charged a Milton teenager after a crash on the 403 sent four people to hospital.
OPP say one person was ejected in Saturday's early morning rollover on the westbound 403, just east of Waterdown Road.
A passenger in the front seat of the car, which ended up in the ditch, was ejected and suffered critical injuries.
All four people in the car were taken to the Hamilton General.
Investigators believe speed was a factor.
The 18-year-old driver has been charged with dangerous operation of a motor vehicle causing bodily harm.
He's scheduled to appear in court April 8.