A crash on the A470 between Brecon and Bronllys caused traffic queues this morning.
The collision, involving a bus and a tractor towing a trailer, took place at around 8.40am.
Police and ambulance services attended the scene with Police directing the queues of traffic.
A spokesperson for Dyfed-Powys Police said: "Police attended a two vehicle road traffic collision which occurred at about 8.40am, this morning (Wednesday Aug 2) on the A470.
"A bus and a tractor towing a trailer were involved in the collision."
Traffic was controlled by officers until both lanes were open at about 10am.