The A483 near Llanwrtyd Wells is expected to remain closed until just after midday after a lorry overturned.
The lorry overturned at around at 7.30am and partially blocked the A483 between Llanwrtyd Wells and Cynghordy. Police have been directing traffic in the area.
The road was closed at 10.15am for the lorry to be recovered, and is expected to remain closed for up to two hours.The road reopened by Friday lunchtime.