I used to get driven out that way quite a lot cuz my boyf who was from banchory, had a mate in fettercairn... all I can say is that it was fairly hairy at times! Mostly because they were speeding like loonies.
Someone came a cropper there a few years ago racing over from Banchory. They were almost at the Clattering Brig coming down by the old ruin lost control and tried to fly in a pug 106. Peugeots can't fly and if I remember rightly two of the three in the car died. I use to live along at Drumtochty Glen and was out walking the dog that day and an ambulance passed me heading for Aberdeen blue lights on doing about 10 miles an hour. They were in no hurry.