The incident occurred at Buttersyke Bar roundabout, where the A658 meets the A61, at around 7am on Thursday 22 September 2011.
A blue Peugeot 307 travelling towards Knaresborough hit the central reservation before colliding with a lamp post and coming to a stop.
Officers investigating the circumstances surrounding the incident are appealing for any witnesses to come forward.
Traffic Constable Mark Mullins, of Harrogate Roads Policing Group, said:
The collision occurred on a fairly busy roundabout, therefore I am hopeful that there will have been some witnesses around at the time.
I am appealing to anyone who saw what happened or saw the blue Peugeot prior to the collision to come forward with information.
Anyone who can help the police with their enquiries is urged to contact TC Mullins, of Harrogate Roads Policing Group, on 0845 60 60 24 7, quoting reference number 12110160843.