UPDATE: 8.50am:

Traffic is slow but moving both ways between the Lower Dock Street junction and the Corporation Road junction in Newport.

UPDATE: 8.16am:

There is queueing traffic on the A48(M) westbound between M4 J29 and J29A A48 Eastern Avenue (St Mellons).

UPDATE: 8.10am:

There is congestion on Cardiff Road in Newport at the Pont Ebbw Roundabout.

UPDATE: 7.58am:

The crash on the A449 has now been cleared. The road has fully reopened.

UPDATE: 7.39am:

There is heavy traffic on the A48 outbound at the A4072 Forge Road junction in Newport.

And the M4 is busy but moving westbound between J24, A48 at the Coldra Roundabout and at J26 (Malpas Road). 

7.32am:

THE A449 is partially blocked northbound between the Coldra roundabout in Newport and the Usk Interchange because of a crash involving two vehicles.