How so? Are they very twisty or is it just there are some dangerous bends?
There are a lot of fast straights which can end in a tight corner,being fenland there are mostly very deep drainage ditches next to the roads.There is also a fair amount of subsidence on the roads with a fair amount of camber which tends to draw you across to the nearside and the ditches This is mainly on the smaller roads but can appear on the larger as well.