An elderly man received life-threatening injuries when he reversed into a parked car in Walton.
Police and the ambulance service were called at 7.45pm to Annett Road, where they found the man in his eighties seriously hurt.
He was immediately taken to hospital, where his family are with him.
Nobody else was injured.
Surrey Police wants to speak to anyone who saw or heard the crash, or was there in the moments leading up to it or afterwards - before emergency services arrived.
Anyone with information is asked to call 101, quoting reference PR/45180052646.
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