It starts again at Hereford, crosses the Wales-England border over the River Monnow, continues south to Abergavenny and Brynmawr, then continues west along the heads of the valleys, past Ebbw Vale, Tredegar, Rhymney, Merthyr Tydfil, Hirwaun and Glynneath.
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It begins on junction of the A40 and A465 south of Abergavenny and then travels southwards towards Little Mill north of Pontypool.