A serious collision on northbound Crowchild Trail just over top of the Bow River prompted officials to shut down a section of the route and divert traffic away from the scene during the Monday morning commute.

Emergency crews shut down northbound traffic on Crowchild Trail from 17th Avenue S.W. and traffic was reduced in the other direction for several hours while police investigated the crash. 

A male driver, believed to be in his 20s, was ejected from his four-door car in the crash. He was taken to hospital in life-threatening condition, officials said.

Debris from the badly-damaged car was strewn across four lanes of Crowchild Trail.

Sgt. Jason McDonald of the Calgary Police Service traffic unit said it appears the vehicle lost control and struck a guard rail. The man was not wearing a seatbelt, police said. 

"As we can see, just from looking at the damage to the vehicle, I definitely say speed will be a factor in this investigation. But I can't say whether alcohol [or] drugs were involved,” he said. 

Traffic in both directions on Crowchild Trail is moving again. 

Anyone who may have witnessed the crash is being asked to contact police at 403-266-1234 or Calgary Crime Stoppers.