Six people were injured, including three children, in an overnight crash on the Tri-State Tollway in North Lake, officials said.
The accident happened just after midnight on I-294 near mile marker 33 when a BMW heading south made an improper lane change, according to Illinois State Police.
The BMW hit an SUV causing it to lose control and roll over, authorities said.
Inside the SUV were two adults and three children.
The adults were taken to Loyola Hospital in serious condition and the children were taken to Lutheran General Hospital in Park Ridge with minor injuries, officials said.
The driver of the BMW suffered minor injuries and was taken to Elmhurst Hospital.