One lane is closed in both directions and traffic is busy but moving because of emergency repairs and an earlier broken down vehicle on the A449 between the Usk Interchange and the Raglan Interchange.
One lane is closed on the A449 in both directions between the Usk Interchange and the Raglan Interchange because of a shed load of concrete blocks from a lorry.
There are also four broken down vehicles and so there is recovery work underway.
Police are appealing for witnesses after a 44-year-old pedestrian died following a collision on the A449 near Usk.
It happened around 5.39am today when a white Mercedes Sprinter van collided with a pedestrian. Police say the pedestrian, from Tredegar, died at the scene.
A 41 year old man from Monmouth has been arrested on suspicion of death by careless driving and is currently in police custody.
The southbound carriageway is currently closed whilst officers carry out their investigation.
A man who was killed when the van he was travelling in collided with a lorry on the A449 has been identified as 20-year-old Robert Smith, from Bridgend.
His family said: "Robert was a wonderful son to Garry and Catherine, he was a loving big brother to Andrew (aged 18), grandson, uncle, boyfriend, nephew and cousin, as well as a good friend and colleague to many."
"He will be so sadly missed by everyone that knew him and his death will leave a large void in many people’s lives."
A 47-year-old man from Bridgend, travelling with Robert in the van, remains in a critical condition in hospital in Cardiff.
The driver of the HGV, a 57-year-old man from the Birmingham area, suffered minor injuries and has veen released from hospital.
Gwent Police is still investigating the collision, which happened just after 2pm on Monday on the A449 between Usk and Newport.
Officers are asking anyone who may have witnessed the crash to call 101.
One person has died and another left with life-threatening injuries after an accident on the A449 between Usk and Newport, shortly after 2pm this afternoon.
The collision involved an HGV and a vehicle described as a transit-type van.
The sole occupant of the HGV suffered minor injuries and was also taken to hospital.
The road was closed for some time, although the northbound carriageway has now reopened. The southbound carriageway is due to be reopened shortly.
Fog is reducing visibility on the A449 between the M4 J24 / A48 (Coldra, Newport) and the A40 (Raglan Interchange, Raglan).
All lanes are open, recovery work completed and broken down lorry removed on the A449 Northbound between the M4 J24 / A48 (Coldra) and the A472 (Usk Interchange).
The A449 Northbound is closed and there are long delays with stationary traffic after an accident between the M4 J24 / A48 (Coldra) and A472 (Usk Interchange).
All lanes are open and traffic's returned to normal after the accident on the A449 Southbound between the A472 (Usk Interchange, Usk) and the M4 J24 / A48 (Coldra, Newport).