At around 7.15pm on the evening of 12th February 2015 collided with a man who was walking across the pedestrian crossing in West Wycombe Road, close to the BP petrol station.
Following the collision the vehicle failed to stop and continued along West Wycombe Road towards High Wycombe town centre.
The 30 year old pedestrian sustained life-changing injuries to his leg, back and face and was taken to Stoke Mandeville Hospital by ambulance, where he remains.
West Wycombe Road was closed until 10.25pm while Roads Policing officers investigated the circumstances.
The vehicle involved in the collision is described as being a silver or white small car.
Sgt Dominic Mahon, from the Joint Operations Unit for Roads Policing based at Amersham, said: ‘I am appealing for anyone who saw what happened during the collision or anyone with any information about the incident to speak to police.
I would also like to speak to anyone with any information about identity of the driver involved as this person may be able to assist police with their enquiries.‘
Thames Valley Police are appealing for anyone with information about the collision to please contact Sgt Mahon via the 24-hour Thames Valley Police enquiry centre on 101 quoting URN 1317 12/2.
If you do not want to speak directly to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111. No personal details are taken, information is not traced or recorded and you will not go to court.