Suffolk police want to trace a man who helped a Stowmarket driver get to safety after he collapsed in his car.
The driver started rolling forward on Gipping Way, at the junction with Milton Road South, on Saturday at around 9.30am while he was unconscious.
As his car doors were locked, several passers-by, including the man police want to identify, stopped the car, smashed a window and got the man out.
The driver was given CPR by the roadside, and a defibrillator was used before the two road ambulances and one air ambulance turned up, along with a rapid response vehicle.
He was transported to the Royal Papworth Hospital in Cambridgeshire where he is in a stable condition.
Suffolk police said on a Facebook post: "Please share, as we would like to find the missing member of this group, who along with these others did such a fantastic thing."
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