UPDATE 8.40am: The road has now fully reopened. 

Gwent Police have been contacted for more information, which we will bring to you when it becomes available.

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UPDATE 8.15am: Traffic on the A4042 north of Pontypool continues to be severely affected, as the map below illustrates.

The A4042 remains closed northbound, and traffic is affected between Sebastopol and Little Mill.

South Wales Argus:

UPDATE 7.55am: The crash has happened northbound between the Usk Road (Court Farm/Horse And Jockey) roundabout and the  Old Abergavenny Road (Mamhilad) roundabout.

There is currently a tailback to the Pontypool ('McDonalds') roundabout.

EMERGENCY services are in attendance following a crash near Pontypool.

There has been a crash on the A4042, heading northbound.

The northbound carriageway has been closed while emergency services deal with the incident.

South Wales Argus:

READ MORE:

The crash has occurred between the junction at the Horse and Jockey pub and the junction for Mamhilad.

Motorists are advised to find alternative routes.