i got two pictures here of what the top of the old road used to look like and the devastation caused to build the new road.......
This is how it looked before the roadworks started, in the middle of those trees is a derelict factory that had been shut for around 15yrs before the work started. They had to knock all that down and then do test explosions, to ensure the rock it all sits on didn't collapse and block the biggest caving network in europe.........which is just down the road at clydach gorge
http://www.brynmawrcavingclub.org.uk/local-caves/
this is one of the reasons the road cost so much to be upgraded
And this is about 3yrs later
as well as the road being upgraded all new pedestrian bridges had to be put in to re-connect clydach south with clydach north, as the old bridges were not long enough and couldn't be kept. As it was now a dual carriageway, new underpasses, roundabouts, junctions had to be built to get in and out of the local villages in the area........
trying to span the huge clydach gorge to create the extra lanes and removed large amounts of the mountain called black rock, is the reason for the over spend and the huge amount of extra time taken
another picture of the area of where the road goes....