The A406 North Circular in Ealing has been closed in both directions.
Traffic monitoring website Inrix confirmed the road has been closed due to an accident, from Tudor Way to Kingsbridge Avenue. The road has been closed since around 12.30am on Thursday (February 3).
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At present, there is no information about the nature of the collision or when the road may be reopened.
Commuters are advised to expect delays in the area. Motorists should avoid the area and plan alternative routes where possible.
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