A one-vehicle accident in Caldwell County injured two occupants.  On eastbound 116 road west of Polo, a vehicle driven by Canaan Miller, 21, of Cowgill, Missouri traveled off the roadway and overcorrected.  As the vehicle departed again from the roadway, it overturned and ejected Miranda Miller, 20, of Cowgill who sustained serious injuries.  She was not wearing a safety device.  Both persons were transported to Liberty Hospital for treatment of injuries.  Miranda Miller was taken by Life Flight.