The northbound A419 is closed after a serious car crash overnight - and will remain closed until 7pm.
The dual carriageway is closed at the B4040 junction for Cricklade to the Spine Road junction for South Cerney.
A 30-year-old man has been rushed to Oxford's John Radcliffe Hospital with serious injuries after the crash, which happened at 2.30am.
The Independendent Office for Police Conduct (IOPC) have been called in 'due to police contact prior to the collision.'
Read more: A410 to remain closed until 7pm
Wiltshire Police are warning people not to ignore the diversion signs. The road is now expected to be closed until at least 7pm.
Traffic was queuing for three miles back to Blunsdon for most of the morning, with traffic in surrounding areas also heavy and severe congestion southbound on the A419 at the A420 Oxford turning.
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Motorist are being warned to give longer for their journeys and that delays are likely until 7pm.
Read more: Police report themselves to IOPC after serious crash on A419
Keep up to date on our traffic feed here.
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