I've never heard the "loup pipes save lives" theory. That sounds like another bad argument from another special interest group to justify themselves. From personal experience in my own automobile, that makes absolutely no sense. I'm not sure if I even hear motercycles when I'm in my car, especially when I'm in a situation where I might hit one, such as at an intersection. That would be like me in my pu truck saying, "keeping my horn on constantly saves lives".