Yet the moment of commitment to a corner is the crucial one, and the way you do it should depend almost entirely on what you see as the corner appears ahead of you. Maybe you have ridden it thousands of times. Maybe this is your first time drawing an arc on this particular stretch of pavement. But even in a corner that I ride every day, one where I know every crack and ripple in the asphalt, I can't commit until my eyes have evaluated the surface first. Even if you have ridden through just minutes before, the situation may have changed. A car might have stopped just behind the embankment or bushes that hide the exit to the corner, or a passing vehicle could have left oil, water, sand, tacks, a ladder, an inflatable wading pool or hundreds of other things in the corner that will upset the perfect balance you created on your last pass.