The carrier flipped onto its side on top of the ramp wall and seven cows fell out of the truck and onto the interstate below.
The cows fell from the ramp from eastbound I-80 onto the northbound Tri-State Tollway (I-294) near Hazel Crest. The ramp was closed for hours following the flipover, reopening at 7:15 p.m. Sunday.
Chopper 7 HD flew over the scene.
One cow escaped from the truck as crews were trying to upright it. The cow, which had a broken leg, charged at some of the workers. Illinois State Police say they were forced to shoot it to put it down.
Illinois State Police have confirmed that one of the cows fell on to the roof of a car on the interstate below. The driver suffered minor injuries and was taken to the hospital.
The ramp remained shut down as of 5 p.m. Sunday evening as crews cleared up the scene. They had to take special care to upright the truck, since dozens of cows remained alive inside.
Traffic in the area was backed up for miles. There was no word Sunday evening on what caused the crash.