Mounties say the driver of a tractor trailer from Winnipeg is in critical condition after the vehicle rolled over on a B.C. highway.

The RCMP say the crash happened Friday evening on the Trans-Canada Highway in Glacier National Park, between Revelstoke and Golden.

The trailer was travelling west when it rolled over at a sharp turn in the highway.

A news release says the driver was airlifted to Calgary in critical condition, while another person in the vehicle was taken to hospital in Golden with non-life threatening injuries.

Mounties are attempting to determine the cause of the crash.

Investigators are examining whether speed, driver inattention and inexperience, or the truck's load configuration were factors.