For those who don’t know that roundabout its offset to one side of the dual carriageway and the straight ahead lane is the middle lane so to go straight on in the direction he was travelling you actually turn a sharpish left onto the roundabout basically doing a sharp 90 degree left turn then a quite sharp right to leave after what would be normally straight on, i.e if you entered at 12 o clock you’d leave about the 7 o’clock position.
The sharp almost 90 degree left then fairly sharpish right round the roundabout catches out the teararses who go tanking up to the roundabout and suddenly find a tight left hander they weren’t expecting which shifts the load over to the right then slingshots it to the left as they continue round the roundabout resulting in them ending up on their side…
View from cab…the path you follow is the white car and then you go round the roundabout where the black car is so quite sharp
But ultimately its because they’re driving too fast.