"The Mountain Road from Abergwesyn to Tregaron, over the Devil's Staircase, has for seventy years or more been one of the most celebrated trials and rally sections in Britain, of which a major hazard was long the triple fords at Llannerch-yrfa, where the road crosses and recrosses the infant Irfon. (Image 1 shows the three fords viewed from the west)
Although the rough shale surface has been replaced by asphalt, some of the bends have been eased, and the fords have been downgraded to Irish bridges, "the Abergwesyn" remains a challenging drive against the clock, especially on a stormy winter's night, when the fords are still capable presenting you with three seething torrents to cross. More than one rally car has been swept downstream - don't believe, though, the tall tales of anyone rejoining the road at the next ford down! (middle ford shown in Image 2: mouseover sent in by Simon Jobson)
The surrounding land of Abergwesyn Common now belongs to the National Trust, and the fords have become a popular spot for visitors to pause.' (last two fords pictured in Image 3 showing the curvature of the stream)"
Link,
http://www.wetroads.co.uk/powys.htm
