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Great stretch of road but beware the Forestry log hauling trucks and would be rally car drivers who seem to think single track roads are built for them alone.
The road goes from Llanwrtyd Wells on the Buith to Llandovery road and winds across the mountain on what is mainly a single track road. Nice for a slow sight seeing day out but not one for high speed cornering (most of them are blind). Just take your time and enjoy.