Originally Posted by License2Ill

It wasn't measuring head injury data in terms of helmet effectiveness. It takes leaps to correlate helmet use with head injury rates when it is not isolated as a factor. Just the same it makes some stupid remarks in the intro about vehicle speeds as if rider heads are hitting vehicles at those speeds when a vehicle is part of an incident. Speeds may increase the severity of impacts but riders involved in impacts caused by vehicles or impacts with vehicles themselves are not impacting their heads at the speed the vehicles are traveling more than the head impacts are happening with the ground most often and all the speed may do is increase the number of impacts or objects struck after being punted. That is oft repeated mythical storytelling stuff. When you head hits the ground when you fall at 40mph, you still fall at the same speed of gravity.