A 19-year-old Northampton man died following an accident on the A45 in Earls Barton on Sunday night.
Just after 11pm on Sunday, October 25, a blue Vauxhall Corsa travelling east from Northampton towards Wellingborough left the road.
The driver died at the scene.
Officers investigating the incident would like to speak to the drivers of a black sport car and a silver or white car which may have been on the A45 at the time.
Witnesses, or anyone with any information about this incident, can call Northamptonshire Police’s Drivewatch Hotline on 0800 174615.