I did a lot of riding this weekend, probably close to 500-miles on both days with both bikes. I'd dare say that I put on 100-miles or more of canyon riding. Yesterday, while making the last run up a familiar but tight canyon road (Latigo Canyon Road out in Malibu), I felt good but for some reason I blew the double-yellow line on the first hairpin. I've ridden this road so many times that I know every rut. So, I shook my head and redoubled my concentration only to blow another double-yellow line a few turns later. Aghast, I slowed down and reexamined myself. I felt good. Shoulders and hands are tired but that was expected. Yet somehow I was no longer in the groove. So, I swallowed my pride and cruised the rest of the way back to the Rock Store, got me some water and went home. I guess I shouldn't be surprised at the loss of concentration considering how much I've ridden, but there was really no physical indication that I was truly tired. Yet my concentration was gone and thank goodness that it was later in the afternoon where there were no traffic coming from the other direction.