I agree with this. You'd better spend your time picking out a casket then worrying about your legal rights for when you get creamed from behind.

I ride with headphones all the time. I cannot hear the cars over the wind noise anyways, and if they are going to hit me I'll get my real warning from having watched their approach in my mirror. Does a car really sound different as it approaches if it is three feet further to the right than it should be?

Plus, without music I would enjoy my ride significantly less and I might even stop commuting.