The B4385 was closed for more than two hours on July 21.
Police say they are investigating a collision in which a motorcyclist was airlifted with serious injuries.
The two-vehicle crash happened on the B4385 between Newbridge-on-Wye and Beulah on July 21.
The road was closed for more than two hours following the collision involving a Suzuki motorbike and a white Ford Fiesta.
A Dyfed-Powys Police spokesperson said the motorbike rider was airlifted to hospital with "serious but not life threatening injuries".
Anyone with information that could help officers with their investigation is asked to report it to Dyfed-Powys Police, either online at: http://bit.ly/DPPReportOnline, by email at: contactcentre@dyfed-powys.pnn.police.uk, or by calling 101.
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