People who know those roads drive fast, indeed, but it is not safe.

Visibility is poor and you cannot safely go through a bend at 50+ mph when you cannot see what's beyond it. There might be a stationary vehicle, a horse, a cyclists, even a pedestrian and you wouldn't know or be able to stop in time. This is how lethal collisions happen in those roads.

Exactly. All these people saying ‘well I know the road’.

Yeah you know THE ROAD not what might be in it this morning.