Megan Rollag, 17, died in a single-vehicle rollover crash on an Interstate 90 overpass in Freeman, South Dakota

The South Dakota Highway Patrol says 17 year-old Megan Rollag of Freeman was killed when the car she was driving went off a road and rolled into a ditch Saturday afternoon. It happened five miles north of Freeman in an area where the road she was traveling transitioned from pavement to gravel.