The A472 is a cross valley link road in South Wales that runs west to east across the old South Wales coalfield from Treharris through Nelson, Ystrad Mynach, Maesycwmmer, Pontllanfraith, Newbridge, Crumlin, Hafodyrynys, Pontypool and thence into the Usk valley, through Little Mill and Usk to a junction with the A449.