UPDATE 2.12pm: All lanes are now open and traffic is rreturning to normal, though congestion remains on the stretch between junctions 25 (Caerleon) and 23 (Magor).
A LANE of the M4 westbound at junction 25 (Caerleon) is blocked, and traffic is slow due to accident.
Traffic is currently queuing back some four miles beyond junction 24 (Coldra).
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here