Drivers are facing delays near the Botley Interchange following a car fire.
Smoke has been blowing across the carriageway and drivers are being forced to queue around the interchange while the incident is being dealt with.
There are long tailbacks for drivers heading northbound with traffic queuing back to the Abingdon North turn.
Drivers are still able to access the southbound carriageway from the interchange.
An ambulance has been seen weaving through slow-moving northbound vehicles heading in the direction of the Botley Interchange.
It is not yet known if anyone has been injured.
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