Nottawasaga OPP is investigating a two-vehicle collision in Alliston that left one of the drivers in life-threatening condition.
Police say the collision happened at the intersection of Industrial Parkway and the entrance to Simcoe Parts Services around 10:30 p.m. on Friday.
A 21-year-old was taken to a local hospital and then transferred to a trauma centre.
No charges have been laid at this time as the investigation is ongoing.
Witnesses are asked to contact the Nottawasaga OPP Detachment at 1-888-310-1122.