Four people have been left with "life-changing" injuries two months after a crash on the M4.
They were injured eastbound near Junction 22, just beyond the Prince of Wales bridge near Bristol.
Avon and Somerset Police has now launched a witness appeal, asking anyone who saw what happened or who has dash cam footage to come forward.
The crash happened just before 1pm on Saturday, October 17.
A grey Vauxhall Astra was stationary in traffic when it was hit by a black Mitsubishi L200.
The four people inside the Astra were taken to hospital with serious injuries, which the police force has described as "life-changing".
A statement issued by the force today (December 16) read: "Enquiries are ongoing and police are keen to hear from anyone who may have witnessed the incident or has dash cam footage which could assist with their investigation."
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Anyone who can help can call 101 and provide the call handler with the reference 5220238440.
Bristol Live reported on an earlier crash just a bit further along the same stretch of motorway that same day, involving a van and lorry.
It led to long tailbacks and resulted in a woman being extracted by the fire service airlifted to Southmead Hospital with a leg injury.
