Ontario Provincial Police say a man in his 30s is in critical condition after a vehicle slammed into the back of a transport truck on Highway 401 on Tuesday night.
Investigators responded just after 10 p.m. to the westbound collector lanes of Highway 401 near Islington Avenue.
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OPP Sgt. Kerry Schmidt said on Twitter that the driver was the sole person in the vehicle and that he suffered life-threatening injuries.
The victim was transported to a trauma centre for treatment, paramedics said.
All lanes of traffic have reopened, and the investigation remains ongoing.