Drivers with dash cams may hold vital evidence as police continue to investigate last week's devastating crash on the A40. 

The incident involving 21 cars in multiple collisions happened on Wednesday shortly before 8.25am.

A 54-year old woman from Gloucester who was a passenger in a white Peugeot and was involved in a collision with a heavy goods vehicle, died at the scene. She has not yet been named. 

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Spokewoman Jessica Rodgerson said: "Officers are particularly keen to hear from anyone with any dash cam footage of the incident, or anyone with dash cam footage travelling on the A40 prior to 8.25am last week.

"They would ask them to get in touch as officers conducting the investigation are trying to get a fuller picture of the weather conditions."

A 56-year old woman also remains in a critical condition in hospital after she was struck by another vehicle when she got out of her car which had also been involved in a collision.

She was taken to the John Radcliffe Hospital with serious injuries where she remains in a critical condition.

A number of people also sustained minor injuries and were taken to local hospitals, from where they have since been discharged.

The road was closed while officers and other emergency services attended and re-opened later in the day.

Anyone with any information which could assist the investigation should call Det Sgt Gavin Collier from the Serious Collision Investigation Unit, based in Bicester, via the 24-hour Thames Valley Police enquiry centre on 101.