For one, I can't really control how I fall in a surprise crash. And two, I'm less worried about the initial impact, and more about being slammed into the paveme

For one, I can't really control how I fall in a surprise crash. And two, I'm less worried about the initial impact, and more about being slammed into the pavement. Like I said, the body is really good about protecting the head. You need to focus on the initial impact. The back of your skull slamming into a windshield or truck hood is a far bigger concern than falling on your face, when you have arms and neck muscles to protect you.