A southern section of the ring road is blocked after a crash this morning.
The collision, which involved a motorbike and a car, has led to the A423 Southern By-Pass Road Westbound becoming blocked.
The accident happened between the Heyford Hill roundabout and the Abingdon Road roundabout.
Details first emerged at about 7.45am, although further information has so far not emerged.
Traffic is building up on that section of the ring road up to the Cowley junction.
Live updates will be automatically posted on our Live Traffic Service.