But so does the Internet, and GPS, and FM radio for that matter. I don't think anyone is saying these must be 100% available, but certainly these are sources of data the car can draw upon when they are available.The problem with all of this is it's dependent on a ton of interconnected technology and falls apart as soon as any of the links fall apart. (just as an example, I was driving to work today and had no connectivity in suburban Minneapolis.) Not to mention the issues faced when you get to less-traveled areas, new obstacles, etc.