A man from Lincoln is seriously injured after his black Peugeot 308 crashed on the A158 Wragby Road in Sudbrooke on Sunday, January 29.
Police say there were no other vehicles involved in the crash, which took place at 4.20am.
The man, whose age is not yet confirmed, was initially taken to Lincoln County Hospital suffering from a head injury.
It is understood he was later transferred to a hospital in Sheffield. There were no other occupants in his vehicle.
The A158 Wragby Road was closed until 8.30am.
Police are appealing for any witnesses who saw the collision or the Peugeot being driven prior to the incident.
Anyone with information should contact the Collision Witness Hotline on 01522 558855.