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

Section of the old Holyhead Road, approximately 400m long, running along an engineered terrace above the gorge of the Afon Ceirw, above the Pen-y-bont falls. The road formation, recently cut off by a new cutting through the anticline, is 8m wide, with a continuous parapet wall on the outer edge rises directly from the slightly battered retaining wall, generally c5.5m high. The parapet connects with the S parapet of the listed Pont Glyn Diffwys at the N end, and has, from this end at approx. 146m, a narrow looped viewing point or outlook, and, at approximately 373m, a second cylindrical one 'a kind of looking-place...forming a half circle' above the 'profound ravine' (Borrow). The parapet is of stone, rebuilt in certain sections, but originally with stone on edge coping, mostly now replaced with a stone-aggregate concrete coping.