UPDATE: 8.50am

Queueing traffic is also very congested on Lighthouse Road in Duffryn also along Forge Road.

UPDATE: 8.05am

All lanes are now clear but there is still heavy traffic and congestion leading back to J30.

The map shows the extent of the heavy congestion stretching between J23a and J30 (dark red shows heaviest congestion):

South Wales Argus:

UPDATE: 6.45am

A CRASH involving a van has blocked one lane on the M4.

One lane is currently blocked and there is slow traffic on the M4 eastbound between J24, A48 (Coldra) and J23a, B4245 (Magor Services), because of the accident.