One lane is closed on the M4 westbound at J8 J9 A404(M) Maidenhead causing traffic queues of four miles following an accident involving six cars.
The congestion goes back to to J6 (Slough / Windsor) and travel time is estimated to be about 40 minutes.
Lane three remains closed after an accident in lanes two and three which happened at 8.45am.
Drivers are advised to avoid the area.
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