It doesn't look like a difficult turn to me but it would be slow, the lorry starting from rest.
With fast traffic both ways, there could be a lot of looking and waiting. I wonder whether this is another case of "looking but not seeing" or of a driver mistakenly believing that he/she had been invited to pull out by an apparent or actual flash of headlights. Reduced visibility may also have been a factor.
Sometimes, sadly, it really is an accident, even if it is one that could have been avoided. Given the less than ideal arrangement of slow, heavy vehicles coming and going directly on to a fast stretch of A road, and especially when turning right, I hope the investigation spends at least some time on the other factors possibly involved and not just the drivers' actions.
Shame the roundabout to the east isn't a bit nearer, but it would still be possible to put an acceleration/joining lane in, and oblige all lorries leaving the site to turn left. I don't suppose either Brett's or the responsible highways authority will want to pay for a new roundabout at the site exit.
Thinking aloud. Probably rubbish.
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