A lane has been closed on the M4 Westbound between junctions five and six as a result of a crash between the two junctions.
Traffic has built up with one lane currently closed because of the earlier crash on the road.
Congestion is also affecting the London-bound carriageway as passers by slow to look at the crash.
There has also been an accident on the M4 Westbound after junction 8/9 A404(M). Two lanes have been closed as a result.
Both incidents have now been cleared.
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