A driver is in serious condition after a wheel flew off a SUV and struck a vehicle on a busy Ontario highway.

Ontario Provincial Police say the front left wheel came off a SUV travelling south on Highway 400 Saturday morning near the town of Innisfil, Ont., which is located about 88 km north of Toronto.

According to police, the wheel went flying into the northbound lanes of the highway and struck a car. The driver, a man in his 20s, suffered serious injuries and was airlifted to Sunnybrook Hospital.

“When I arrived on scene he was trapped in the car,” Sgt. Krunoslav Maruniv told CTV Toronto, who explained that the roof had collapsed.

Paramedics had initially considered the driver’s facial and internal injuries as life threatening. He is now expected to survive.

The driver’s wife, who was also in the car, was treated for minor injuries and shock.

OPP Sgt. Clayton Brown told CP24 the investigation is ongoing. The SUV and the wheel have been impounded.

No charges have been laid.

With files from The Canadian Press and CP24