UPDATE: 9.57am

All lanes are now open. Recovery work completed, accident cleared, and traffic returned to normal.

UPDATE: 9.50am

Gwent Police have now confirmed only one vehicle was involved in the crash. The driver of the Audi car has been taken to hospital as a precaution after emergency services were called at 8.10am.

UPDATE: 9.35am

Emergency services have left the scene but one of the vehicles remains in situ. Delays remain heading towards the motorway as recovery work takes place.

UPDATE: 8.21am

AN accident on the A449 in Monmouthshire has caused one lane to be blocked this morning.

Three vehicles were involved in the crash on the A449 southbound between A472 (Usk Interchange) and M4 J24/A48 (Coldra).

Lane one (of two) is blocked by a car, van and a car transporter heading towards the M4. Police are on scene.