George Michael is "lucky he didn't die" after he reportedly fell out of a car doing more than 100kmh.
The British singer was airlifted to hospital with a head injury following a motorway accident in the UK last week.
Katherine Fox was driving behind the Range Rover the 49-year-old star was travelling in when she saw him fall out of the passenger door of the vehicle.
She has recalled slamming on her brakes in a desperate attempt to avoid running him over.
"He was lucky he didn't die," she told British newspaper The Sun.
"There was a nasty cut on his forehead and the back of his head. There was blood all down his face and on his teeth. He was breathing and conscious but in shock."
Michael apparently fell from the car into the third lane of the busy motorway. Many drivers had to hit their brakes to avoid running him over.
Fox was terrified Michael was critically injured at first and initially had no idea who he was.
"I saw blood everywhere and a man on the ground. I thought someone had run across the road and been hit.
"I asked what had gone on and was told he tried to open the car door and shut it again because it wasn't shut properly and apparently fell out at 70mph (112kmh)," she explained.
"I was on the phone to the ambulance and said, 'You'd better come quick. This doesn't look good'.
"George was wearing a black and gold Adidas tracksuit that was ripped all down the arm and shoulder. He had no trainers on.
"I grabbed one from the second lane because cars were swerving to avoid it.
"His sunglasses were also in the road. I could hear the crunch as cars drove over them."
As soon as Michael fell from the vehicle the two friends he was travelling with pulled onto the hard shoulder of the road.
They ran to try to help him, with Fox using her car as a barrier between the singer and other vehicles. An off-duty policeman also stopped to help, getting other cars to drive around the incident.
"George didn't say anything, he just seemed in shock," Katherine explained.
"He was sitting down against a car and in the arms of his friend.
"The guy holding him was quite scared. He kept saying to George, 'Are you all right mate?' I think George was lucky he didn't die."
The singer was treated for cuts and bruises but isn't thought to have suffered any serious injuries. Police are looking into the accident.
- Cover Media