Traffic is backed up on the M4 Westbound and the M32 after a huge amount of debris was left scattered across all three lanes of the motoway.
Over six miles of traffic is now queued and delays of almost 50 minutes are expected.
Lanes 2 and 3 are now open as traffic police continue to work to remove the remaining debris left between junctions 18 and 19.
Traffic is reported to be at a standstill.
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