*UPDATE: 10.30AM*

Congestion has now cleared and traffic is moving freely.

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*UPDATE: 8.30AM*

All lanes have now reopened, with the vehicles moved to the hard shoulder - but traffic remains very slow, and the congestion resulting from the crash continues to affect the M4 and A48(M) approaching Newport.

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A CRASH involving two cars is blocking the inside lane of the M4, eastbound between junction 29 (A48M) and junction 28 (Tredegar Park).

As a result, traffic is slow eastbound on the M4 and A48(M) around and approaching junction 29.