Crowchild Trail was closed for over four hours on Monday morning following a crash that sent a man in his 20s to hospital in serious condition.

At about 6 a.m, emergency crews were called to the scene of a crash on Crowchild Trail on the bridge over the river.

Police say that a 1994 Toyota Corolla was northbound on Crowchild Trail over Bow Trail when the vehicle lost control and struck the centre median.

The driver was not wearing his seatbelt at the time of the crash and was ejected from the vehicle.

EMS has confirmed that the man in his 20s was taken to Foothills Hospital in life-threatening condition.

Police say his condition was upgraded to serious shortly after arrival, which is fortunate.

Investigators believe that speed and alcohol could have been a factor in the crash.

Police shut down all northbound traffic on Crowchild Trail at 17 Ave. S.W. for the investigation and were initially just letting one lane through going southbound.

They say the location of the crash presented a particular problem. "The location with it being on Crowchild Trail heading into the core area with the early morning commuters definitely made for a very troublesome commute for people," says Staff Sergeant Jason McDonald with the CPS Traffic Unit. "I definitely feel for the people affected by it."

McDonald says that no one else was injured in the crash and is crediting the centre median with containing the crash. "The median definitely helped save come people's lives. It's a good cahnce southbound traffic could have been affected otherwise."