The M4 Westbound carriageway has been closed J5 A4 London Road (Langley) to J6 A355 Royal Windsor Way (Slough / Windsor) following a serious accident involving a motorcycle and car.

Emergency services are currently at the scene.

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Congestion is currently building all the way back to the M25 (J15).

Thames Valley Roads Policing later confirmed that there will be a closure between junction 5 and 6 "for some time". 

There is also traffic in the diversion routes.

 

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Traffic has been escorted by police to turn around to leave via junction 5. 

More as we get it.