A delivery driver claims he saw a car "speeding on the wrong side of the road" seconds before a horror crash which killed three people.
Mum Alison Clark and two men, who are yet to be identified, died in the tragic collision on the A63 in East Yorkshire on Monday.
A third man is in hospital fighting for his life after the smash, which saw a white BMW catch on fire.
Police said the vehicle collided with a grey Peugeot 3008 on the westbound carriageway, near Melton, at around 10pm.
Gioele Barresi was in his van with his brother when he witnessed the shocking incident, reports HullLive.
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Emergency services at the scene on the A63 on Monday
He claims he was overtaken by a white BMW, which he claims was coming off a roundabout fast – and in the wrong direction.
Gioele said the vehicle was heading the wrong way onto the A63 – before it collided with the grey Peugeot.
He said: "I was going about 60 with the van and he passed me on the other side like I was slow.
"Maybe 10 seconds from that he hit the other car."
Gioele said he saw one vehicle go over the central reservation.
He continued: "I saw one car that went over the barrier in the field, like the car was flipped. Another car was on fire.
Rob described his wife as a "beautiful soul"
"There were parts of cars all over the road.
"It looked like there were other cars involved but I couldn't see because the area was covered in smoke."
It is understood passersby tried to help people in the cars involved.
Alison, of Elloughton, was described by heartbroken husband Rob, 40, as his "guiding star, love and best friend".
He said: "Alison was a beautiful and caring person who I am incredibly proud of, and that is the part of her I want everyone to remember.
"Losing Alison has left a hole in many people's hearts and we are all sad today."
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"It is like having your heart ripped out. I can't comprehend it. I keep expecting her to walk through the door. I feel a tremendous sense of loss.
"I feel incredibly, incredibly sad about losing her and about the idea of Emily growing up without her mum. She was such a wonderful woman and mother.
"She would look out for her interests in everything. She would help her pursue her dreams.
"She was a warrior when it came to looking after people's interests, including our daughter's.
"For me to grow old without my wife is upsetting. I wanted to go on every adventure in the world with her."
Humberside Police said: "Emergency services attended and a woman and two men were sadly pronounced dead.
"A third man was taken to hospital with life threatening injuries, where he currently remains in a critical condition.
"Specially trained officers have been assigned to offer support to individuals involved and their families at this difficult time.
"Investigations are underway into the circumstances surrounding the collision and we would ask witnesses or anyone with dashcam footage from driving in the area at the time to contact us on 101 quoting log 497 of November 22."
Police kept both carriageways closed overnight, with a tent erected at the scene.
The eastbound carriageway opened to traffic at 7.30 on Tuesday with only small delays in that direction but the westbound carriageway remained closed, causing long delays for motorists.
It reopened at 5pm.