"At some point the level of concentration becomes so great that everything becomes surreal. All of a sudden you don't hear the rocks pounding on the bottom of the car anymore. You stop hearing the roar of the engine. And, most alarmingly, sometimes you even don't even hear the codriver! It's sort of like all of these inputs merge into one and go straight through into the car. Once this happens I feel like a passenger. It's a very strange feeling."