Grey Rd. 4 remains closed between Road 55 and Road 63 in the Municipality of Grey Highlands due to a serious two-vehicle collision.
The OPP say at 8:46am n Wednesday, a passenger vehicle and a pick-up truck travelling in opposite directions on Grey Rd. 4 near Road 57B collided head-on.
The driver of the passenger vehicle, a 56-year old woman from Grey Highlands, was taken to hospital by ambulance before being airlifted to a hospital in Toronto where she remains in critical condition.
The driver of the pick-up truck, a 17-year-old male from Grey Highlands, was not injured.