Bow Bottom Trail Calgary

Calgary police say high speed and alcohol may have played a role in a crash on Deerfoot Trail that sent a man to hospital in critical condition.

Traffic is flowing once again after the single-vehicle rollover shut down a portion of Deerfoot Trail near Anderson Road for hours Monday morning as police investigated, backing up morning commuters.

At around 2:15 a.m. MT, police say a 2004 Porsche Cayenne was racing an unidentified vehicle southbound on Deerfoot Trail at speeds of more than 100 km/h.

As the vehicles crossed over Anderson Road, the driver of the Porsche lost control and rolled several times. There were no other passengers.

A 28-year-old man, believed to be the driver, was transported to hospital with critical injuries. His condition has been upgraded to serious.

Alcohol is believed to be a factor, according to police.

Police say there are tire marks on the road that will help them determine exactly how fast the vehicle was going.