A woman is in critical condition after a car and a transport collided west of Harriston.
Emergency crews were dispatched to School Road 7 at Wellington Road 87 Friday morning.
Officials say the transport t-boned the car the woman was driving.
The woman, 38-year-old Karen White of Hanover, had to be extricated from the vehicle.
She was transported by land ambulance to Palmerston Hospital, then she was airlifted to a London hospital by an Ornge air ambulance with serious injuries.
The truck driver, 49-year-old Kenneth Fry of Barrie, was not injured.
Police are investigating the crash, but the road has been re-opened.