Terraced Section of the Holyhead Road, with parapet and retaining wall

The section of the old Holyhead Road is approximately 400 meters long and runs along an engineered terrace above the gorge of the Afon Ceirw, situated above the Pen-y-bont falls. The road is 8 meters wide and features a continuous parapet wall on the outer edge that rises directly from a slightly battered retaining wall, which is generally about 5.5 meters high. At the northern end, the parapet connects with the southern parapet of the listed Pont Glyn Diffwys. There is a narrow looped viewing point or outlook at approximately 146 meters from this end, and at around 373 meters, there is a second cylindrical viewing point described as "a kind of looking-place...forming a half circle" above the "profound ravine" (Borrow). The parapet is made of stone and has been rebuilt in certain sections; it was originally constructed with stone on edge coping, although most of this has now been replaced with a stone-aggregate concrete coping.