Thames Valley Police is appealing for witnesses and dash-cam footage following a road traffic collision in Milton Keynes.
At around 1.55pm on Saturday (25/3), a red Nissan Juke and a silver Aprilia RSV4 motorbike were involved in a collision on the Redbridge roundabout that leads to H3 Monks Way and V8 Marlborough Street.
The rider of the motorbike, a man in his forties, sustained serious leg injuries and was taken to hospital where he remains.
No arrests have been made.
Investigating officer, PC Steve Leathersich, of the Joint Operations Roads Policing Unit, said: “I am appealing to anyone who may have witnessed this collision to please come forward.
“I’d also ask any motorists with dash-cams who were in the local area around the time of this collision to please check any footage in case it may have captured something that may assist with our investigation.
“Anyone with information can contact police by calling 101 or by making a report online, quoting reference 43230132465.”