A cyclist was air ambulanced to hospital where she remains in a serious condition following a roundabout junction car crash.

The woman in her 50s suffered serious injuries and was taken to the Oxford John Radcliffe Hospital due to a collision at the Radley roundabout near Abingdon yesterday at 2pm.

South Central Ambulance, the Thames Valley air ambulance and Thames Valley Police attended the scene after the cyclist was struck from behind by a grey Skoda Octavia car.

READ MORE: Live: Air ambulance called to Radley crash near Abingdon

Thames Valley Police has now launched an appeal for witnesses on Saturday morning.

Investigating officer, PC Shaun Kipling of the Roads Policing Unit, said: “I’m appealing to any witnesses, anyone who has footage of the collision or either the bicycle or vehicle prior to the collision, or anyone else with information to come forward."

The woman had been been wearing a high-visibility vest and helmet and riding a grey electrically assisted pedal bike, travelling along the Radley Road from Radley towards Abingdon at the junction of Radley Road, Twelve Acre Drive and Audlett Drive.

Bus services to the Radley area were impacted yesterday as the the crash led to multiple road closures in the area.

PC Kipling added: "We thank the public for their cooperation and support while the road was closed until 8pm to allow emergency services to treat the woman as well as to ensure officers could thoroughly investigate the scene.”

Police say the easiest way to contact them is by leaving information via their website.

Alternatively, anyone with information can visit a police station or call 101 quoting the investigation reference which is 43230506274.