UPDATE: 4.52pm

A reader at the scene said the whole tanker spewed beer over the road - not just a barrel. He said: "Your report says a "barrel" but it was an entire "N-Virocycle" tanker. I was working near the road. I heard a big bang and when I looked towards the road, I saw the liquid shooting out the top of the tanker."

UPDATE: 3.17pm

A barrel of lager exploded on the carriageway and firecrews are hosing the beer off the road.

UPDATE: 2.59pm

FIRE crews are dealing with a spillage of beer from a lorry on the A467 near Risca.

South Wales Fire and Rescue Service is urging drivers to take car passing the incident, which may cause disruption to traffic whilst it is cleared.