Four people were injured in a fiery crash on the Edens Expressway near Northbrook late Sunday night.
It was all caught on video by a witness.
Illinois State Police say a semi-truck was heading northbound on the Edens when the driver tried to merge into the center lane and swerved hitting a car and then crashed into a wall near tower road.
The truck then burst into flames, with the trailer sitting on top of a car.
One person was critically injured with severe burns.
Three other people were taken to the hospital.
All lanes of the Edens were shut down for several hours but are now back open.