Ontario Provincial Police say all westbound express lanes have reopened following a serious crash on Highway 401 in Mississauga on Thursday morning.
Police said the express lanes were closed at McLaughlin Road following a crash.
Peel Paramedics said they responded to the crash between two tractor trailers at around 2 a.m.
One man was taken to hospital with non-life threatening injuries, police said.
Another man was taken to a trauma centre via air ambulance in critical condition, police said.
Shortly after 10 a.m., police said the highway had reopened.