I1The route of the main new trunk road is a route situated between Abergavenny and Hirwaun in the County and County Boroughs of Monmouthshire, Blaenau Gwent, Caerphilly, Merthyr Tydfil, and Rhondda Cynon Taff and is a route about 40.6 kilometres in length starting at a point on the Trunk Road (marked “A” on the deposited plan at key plan No. 1), some 40 metres west of the centrepoint of the Hardwick Roundabout at Abergavenny and going in a general south westerly direction to a point on the Trunk Road (marked “B” on the deposited plan at key plan No. 2), some 800 metres north west of the centrepoint of the Rhigos Roundabout at Hirwaun Ponds.