UPDATE: 4.52pm.

The road has now re-opened.

UPDATE: 1.58pm

A spokeswoman for the Welsh Ambulance Services said the man was taken to the Royal Gwent Hospital. She added they sent a rapid response car and an emergency ambulance after being called at called at 11.15am.

UPDATE: 1.42pm

A spokeswoman for Gwent Police said one male driver was checked over at scene by paramedics and his condition was not life threatening.

Firefighters were called at 11.13am and the driver of the lorry was released before crews from Malpas and Maindee arrived. They left at 12.01pm.

UPDATE: 1.39pm

There are no estimates as to when the road will reopen. There is no access to the northbound A4042 towards Cwmbran from the M4. A diversion is in place via the A4051.

UPDATE: 12.39pm

The tanker has overturned on the Sainsbury's slip road on to the Grove Park Roundabout.

UPDATE: 12.19pm

The A4042 at Grove Park roundabout is now closed.

UPDATE: 11.46am

A TANKER has overturned on the A4042 roundabout near Sainsburys in Newport.

The road is partially blocked northbound and very slow traffic reported.

Emergency services are at scene.