A 71-year-old woman remains in Stoke Mandeville Hospital after her car hit a fence and then a parked Audi.
The woman was driving a white Ford KA in London Road, Wendover at around 5.40pm last night (Monday) which left the road.
It hit a fence and then a parked black Audi causing extensive damage to both.
Police say there may have been another vehicle involved in the collision which did not stop at the scene and they are keen to speak to anyone who with information about the incident.
Anyone with information is asked to contact PC Neil Stephenson on 101 quoting URN 1170 27/4.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.