The A4059 road is a single-carriageway north-south road that runs between the A470 at Brecon Beacons National Park and the A470 at Abercynon.Southbound, the A4059 begins by turning right off the A470 to the south of Storey Arms, just after passing the Beacons Reservoir. The road crosses the top of the reservoir's dam before climbing away from the trees and onto exposed moor land to the west of the A470.
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