Ontario Provincial Police say a 21-year-old woman remains in serious, life-threatening condition after a single vehicle crash on the QEW in Oakville on Sunday.
Emergency crews were called to the highway near Ford Drive at around 6:30 p.m.
Police said a black sedan had rolled over multiple times, off of the highway crashing through a fence and ended up on North Service Road.
The woman was ejected from the vehicle, police said.
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She was taken to a trauma ward at Hamilton General Hospital by paramedics.
Investigators have not said what led to the crash or if speed was a factor.
The road has since reopened.