I know several "tricks" for advanced driving since I've attended a course or two. One of the ones that the Police Pursuit drivers use, especially the motorcyclists is to look at the verges and/or hedges on the roads edge, as they are a great visible indicator of how sharp a bend is, A road can seem quite gentle on some corners, but by looking at the edge of the roadside their are plenty of visible indicators that will show how much sharper a bend is than the road will normally show. High Hedgerows, trenches, trees (even trees visible in the distance) can all give an indicator of how a road is progressing, long before the road will show you. Spent many years on a motorcycle "getting my knees down", so I know all the tricks to driving into and out of corners at high speed and anticipating the road and bends ahead. That, and one of my best mates when I was younger was a Advanced Police motorcyclist, His was the job of chasing down the speed junkies in their souped up motors and Bikes. They love the Welsh roads cos of all the lovely sweeping bends.