Officers investigating the fatal collision on the M5 are appealing for the driver of a vehicle involved to come forward.
Tri-Force Chief Inspector Yan Georgiou said: "The driver of the MG Rover fled the scene of the collision before police arrived. Despite extensive enquiries to trace him, he has not yet been identified or located. It is also not known whether there were any passengers in the vehicle.
"We are now appealing for the driver themselves to come forward, or for members of the public to provide information to us to help identify and locate them.
"Their account of the collision is vital to our investigation and we urgently need to speak to the occupant or occupants of this vehicle to fully understand what happened during this tragic incident.
"I would like to thank those witnesses that have already come forward with information."
The incident involved five vehicles and started when a Ford Mondeo and an MG Rover were in collision about half a mile south of the M50 junction at 1.05am today (Thursday 2 June). A HGV then stopped and was involved in a collision with a silver Mercedes and black Mazda.
The 24-year-old Gloucester man who was driving the Mercedes died at the scene while a 23-year-old Gloucester man who was a passenger in the vehicle also died. Another passenger in the Mercedes, a 23-year-old Gloucester man, was taken to Queen Elizabeth Hospital and remains in a critical condition while the final passenger of the Mercedes, another 23-year-old Gloucester man, remains in a critical condition in Southmead Hospital.
A man who was a passenger in the Mazda and a man who was driving the Mondeo were taken to Gloucestershire Royal Hospital. Both are believed to have suffered injuries that are not life threatening.
The MG Rover driver or anyone else with information is urged to call police on 101 quoting incident 17 of 2 June.
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