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The A312 is closed northbound at the junction of Ossie Garvin Roundabout following what police are calling a "serious collision".

Posting on Twitter at 8.33pm on Thursday (May 25), Hillingdon Police advised motorists to avoid the area.

The Tweet read: "Serious collision on the northbound carriageway of the A312.

"Road closures in place, please avoid where possible. #HERT3"

Hillingdon Police say the collision is serious

According to Transport for London, traffic is being diverted.

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Blog closes

As we bring our blog to a close, the A312 northbound remains closed at the junction of Ossie Garvin Roundabout in Hillingdon.

Four cars were involved in the collision, and there have been two arrests for driving offences.

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Two arrested for driving offences

http://2 arrested for driving offences

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'Use other routes'

One their website, Transport for London write: “Traffic is slow on approach with tailbacks to Bulls Bridge Roundabout.

“Expect delays and use other routes”

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Traffic appears to be flowing at junction with M4

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Queues are back to Bulls Bridge Roundabout

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'Serious collision'

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