A man in his sixties was taken to hospital after a crash on the A418 Aylesbury Road near Haddenham on Sunday 12th September.
The man who was riding a motorbike sustained serious injuries and remains in hospital following the collision with a black VW Golf.
Thames Valley Police are appealing for witnesses to the crash that happened at 11.05am on Sunday.
Investigating officer, PC Richard Minney, of the Roads Policing Unit, based at Milton Keynes, said: "I am appealing for witnesses to this incident whereby a motorcyclist has sustained serious injuries after this collision.
"I would ask that anyone who was in or near the area in which this collision took place, to get in touch with us if you saw anything or have any information on it.
"Also, if any motorists in the area that have dash-cam please check as to whether anything significant was caught, as it could help our investigation.
"You can contact police by calling the 24-hour non-emergency number 101, quoting reference number 43210410395, or by making a report online."
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