Two people have been taken to hospital following a "serious collision" on the A470 on Wednesday. Police have warned motorists that the road is likely to be closed "for some time".
The A470 between Merthyr Tydfil and Brecon has been closed since around 5am following a one-vehicle crash at Storey Arms. Two people have been taken to hospital.
Traffic Wales South said there was "heavy congestion" on the A465 Heads of the Valleys Road while the closure is affecting traffic between Hirwaun and the Defynnog turn-off. According to traffic monitoring system Inrix the road closure has been extended to help with traffic management. Northbound traffic will not be able to join from Cefn Coed roundabout.
