NO-ONE will ever know what caused an experienced driver to leave the road and crash into a wall, killing her instantly.
Michaela Cook (24), who was known as Miki, died when her car came off the A1073 in October last year and hit a wall.
An inquest held at Peterborough Town Hall on Friday ruled her death was accidental.
Miss Cook was returning to her home in Moulton Chapel on October 15 with her brother Doulton (18) when the accident happened between Eye Green and Crowland.
Speaking at the hearing, her dad Joe Cook said she was an experienced driver who sometimes drove his lorries for him.
He added: “I’m trying to find out why she came off the road, if I don’t my head is going to explode.
“I need to know, I need to get closure.”
The inquest heard from several drivers who were heading north along the A1073 close to Mason’s Bridge.
Witnesses described seeing a queue of traffic behind a 1959 Chevrolet Apache pick-up truck which was travelling at between 45mph and 55mph in a 60mph zone.
Miss Cook overtook a car and pulled in but when she went to pass a further three cars something went wrong and she came off the road into the dyke which runs alongside.
Doulton, who was on crutches at the hearing, told the inquest he only remembers the crash through flashbacks he had while recovering.
He suffered serious leg injuries in the crash and had to be airlifted to Peterborough City Hospital.
Peterborough coroner David Heming read out a statement Doulton gave to police last year.
He said: “As we passed I thought Miki said something like ‘he’s just clipped my car’.”
But Doulton said he didn’t feel anything and investigations after the crash showed nothing had hit the car.
Witnesses said they might have seen a white car move to the right, as if the driver was looking round the pick-up truck or about to overtake.
It was speculated that Miss Cook could have seen this movement and thought the car was about to pull out, prompting her to take action.
Wayne Dunn, who was driving the pick-up truck, became emotional at the hearing and apologised to the family for not doing more to help Miss Cook.
Recording a verdict of accidental death, Mr Heming said: “I can only apologise if you can’t get the closure you wanted.”
A post-mortem report said Miss Cook died of multiple injuries.