No, you'd be wrong about that. State vehicle registration law does not override federal trademark law. As soon as you are damaging the value of their mark, you're history.
Not exactly. Factual use of a trademark by a third party is not infringement. As long as what you are selling is an actual Ford product, you are free to call it a Ford without Ford's permission, and they cannot stop you. If your company customizes or modifies a product and resells it, you can call it what it is by using the original manufacturer's name and product name. You cannot imply that you are that original company though. See, for example, Lingenfelter's marketing of Chevrolet-compatible parts and customization of Chevrolet vehicles. Similarly, you can use a third party's trademark to factually identify what your product works with. For example, an independent company that makes iPhone cases can call them iPhone cases and identify which models they work with. They cannot label their own product an iPhone though, or imply that it is made by Apple.
The idea of handling back the controls to the driver whenever the car encounters a situation it can't handle any more is patently absurd.
That's how every autopilot system works. It's the only failure mode that aircraft engineers have deemed appropriate in decades of development. What better solution is there?
I suspect that you got "patents" and "copyrights" mixed up here. Your sentence is the classic way of explaining what a "copyright" is: "Copyright doesn't cover an idea -- it only covers the expression of an idea." Patents very much cover the whole idea. For example, nobody can use the idea of one-click-purchasing on a web site without infringing Amazon's patent. Even if you write all the code yourself, you're still in violation of the patent by using just the basic IDEA...
No, I did not mix them up. You're missing the entire distinction at issue here: Copyrights cover expression, patents cover implementation. All of your examples of patents describe prohibitions on the *use* of ideas, not on the communication of the ideas themselves. In fact, the whole purpose of the patent system is to encourage free public dissemination of the ideas underlying the patent - in exchange for a monopoly on the actual use of those ideas in the real world. Amazon does not own the *idea* of one-click purchasing. You can talk about it all you want, theorize about it, come up with improvements to it; whatever. What you can't do is actually put it into use. You can patent a method of producing a molecule, or a specific use for a molecule, but you can't patent the idea of the molecule itself. Everyone else can still draw it, talk about it, analyze it, make it using other methods or use it for other purposes, and do anything else they want with it - as long as they don't do the specific thing your patent covers. They can talk about your patented thing; they just can't actually DO your patented thing. Software, by itself, is merely an idea. An expression (in all senses of the word). That's not the stuff of patents. A patent may keep you from using software to do something, but should not prevent you from writing the software in the first place.
God doesn't play dice. -- Albert Einstein