Bracebridge OPP is investigating the cause of a serious collision that closed Highway 11 southbound just past Gravenhurst.

Last night, police were called to the collision near Sparrow Lake Route D.

The vehicle had rolled and the 48-year-old man driving was thrown from it in the process.

He was airlifted to a Toronto-area hospital in serious condition.

The passenger was taken to hospital in Bracebridge.

Police are hoping anyone who witnessed the collision can provide details on what happened.

If you do have any information you’re asked to call police or Crime Stoppers.