Two people suffered serious injuries in a single vehicle accident in the Town of St. Lawrence overnight. According to the Waupaca County Sheriff’s Department, a car heading north on Colrue Road, about 4 miles southwest of Ogdensburg, left the roadway and crashed into some trees shortly before 2:30 this morning. Authorities say when they arrived the male driver was found laying on the pavement being attended to by a passerby. A female passenger had to be extricated from the vehicle by Ogdensburg firefighters. Both the driver and the passenger were airlifted to ThedaCare Hospital in Neenah with what were described as critical, but not life-threatening injuries. Their names have not been released, as the accident remains under investigation.