The Iowa State Patrol is investigating a head-on traffic collision that occurred almost 2 miles west of Clarion yesterday morning. An eastbound minivan driven by 47 year-old Rockwell City resident Lisa Ann Berry collided with a truck driven by 44 year-old Dean Johnson of Livermore yesterday at 6:50am on Highway 3. The State Patrol says Berry's vehicle crossed the centerline of the roadway and collided head-on with Johnson's vehicle. Berry was pronounced dead at the scene. She was not wearing a safety belt. Johnson was airlifted to Methodist Hospital in Des Moines with non-life-threatening injuries.