Ah but Edinburgh is the Capitol City and so was a major improvement - or so I am told. It all went belly up as many predicted.
The south section to Perth is a great road but many tourists and others get confused as to if they are on the 'two lane road' or one of the dual sections, but it is always clearly marked.
The 170 ish miles of road that flips between good quality A road and dual carriageway often has a separate physical carriageway and people forget which they are on.
However the northern section is pretty good quality A road, and has seen many hairpins reduced for the Wind Farm equipment travel requirements so it ought to be 'easy'.
It was however a road that saw me have 5 skids on, when diesel had been spilled on various corners (and some had some extremely dangerous drop offs !) so I reported it to the Police and on my return journey many hours later, there were lots of clear temporary signs.

It is a good road with good opportunities to overtake the slower vehicles in many places. When one is not familiar with the road learning when the distances are foreshortened, or are genuinely of a great long distance of perhaps a mile or two.
I would very much like to see all the stats and break down where the accidents have occurred and for what reasons. It is clear that proper research is needed to ensure that the best processes are put in place to try to improve people's abilities and ensure good sound engineering / traffic solutions.