UPDATE: 7:37am

ALL lanes of the M4 eastbound are open between junctions 27 and 28 on the eastbound carriageway following the earlier incident which involved three vehicles

Traffic remains heavy on the stretch of motorway, with congestion stretching back onto the A48(M) and to junction 30 Cardiff Gate.

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ONE lane of the M4 is closed on the eastbound carriageway following an incident involving three vehicles, causing heavy and queuing traffic.

The incident took place between junction 28 Tredegar House and junction 27 High Cross, with congestion stretching back to junction 29A for the A48(M).