A 22-year-old man was seriously injured when his car crashed into a street sign in Desborough.
The man was driving a black Ford Ka south along Rothwell Road just before 11.30pm on Tuesday, May 20, when his car left the road near the junction with Pioneer Way.
Police officers investigating the collision do not yet know why the vehicle left the road.
The man was taken to University Hospitals Coventry and Warwickshire for treatment to his injuries.
Witnesses or anyone with any information about this incident can call the police on 101 or the Drivewatch Hotline on 0800 174615.