I apologize for not responding earlier. It seems that there was a bit of a misunderstanding about the function of the deflectors. While if a rider had to lay his motorcycle down, it is possible that the deflector could be helpful in protecting the rider's knee. But that is not what the deflector was designed to do. While the windshield has air flowing up and over the front of it, a air stream is being drawn up the back side of the windshield. The air deflectors block the annoying and deafening part of that air stream that would hit the rider's face.