Last spring, while on a ride near Billings, MT, I was hit/sideswiped by a 3/4 T pickup truck while I was going up a hill around a curve to the right. Though I was in the middle of the shoulder that was a couple feet wide, the driver drifted to the right side of the road, caught me with the side of his pickup and rear view mirror. I was flipped over a complete 360 with my head as one of the pivot points and the helmet received a significant blow on the pavement. I had some significant bumps and bruises on my body (still surprised there were no broken bones) that took a long time to heal but the helmet is what allowed me to at least walk away from it! You may be doing everything right but there may be other factors beyond your control that, without a helmet, could screw your life up forever!