UPDATE: 9.25am
"Severe" delays both ways on the A4810 in Monmouthshire between Magor Traffic Lights and the Tesco Distribution Centre in Llandevenny are continuing due to an accident between two vehicles.
South Wales Fire and Rescue say they do not have crews at the scene.
UPDATE: 8.17am
M4 Malpas Straight both ways busy but moving at J26 A4042 / A4051 (Malpas Road).
UPDATE: 8.11am
An accident between Magor traffic lights and the Tesco Distribution Centre in Llandevenny on the A4810 in Monmouthshire is causing delays on both sides of the road.
Police are directing traffic following the crash, which involved two vehicles.
UPDATE: 7.52am
The traffic lights are now working again.
UPDATE: 6.46am
There has been a traffic light failure this morning on the Colda roundabout in Newport, just off the M4.
Drivers on the A48 should approach with care.
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