A moped rider suffered a serious leg injury in a hit-and-run collision at Headington Roundabout in Oxford, police have said.
The man, who is in his twenties, was involved in a collision with a dark hatchback at the junction with the A40 London Road at about 7.30pm on Wednesday 21 October.
The hatchback driver did not stop. Thames Valley Police said no arrests had been made when it issued its appeal on Friday 23 October.
Investigating officer PC Craig Ridgley, of the Joint Operations Roads Policing Unit, is asking witnesses to come forward. Officers also want dashcam or CCTV recordings from vehicles, homes or businesses that could show the collision or what happened beforehand.
Anyone with information should call 101 or report it through the Thames Valley Police website, quoting reference 43260551984.
Information can also be given anonymously to Crimestoppers on 0800 555 111.
The full police appeal was published on 23 October.
