I believe riders crash in corners because they override sight distance--they ride faster than they can see in time to stop, swerve or safely react when the road tightens or something unexpected appears in their paths. Typically, riders make it through the first two-thirds of the corner and then just straighten up the remainder. What rapidly comes into view is a tree, utility pole, highway sign or, in really bad cases, a rock wall, cliff or approaching vehicle. The rider's attention is distracted at the worst possible moment. His eyes lock on the object and he is drawn in that direction as if guided by wire. I've visited crash scenes where there is nothing near the impact area except for a rural mailbox that's been snapped off at the ground. The rider could have cleared it on the left or right if target fixation hadn't taken over his guidance system that day. Your eyes are your guidance system! They feed your shoulder-mounted supercomputer the critical information necessary to corner safely--speed, slope, radius, path, obstacles, etc. The only thing you have to do to begin collecting that information is face your intended path of travel.