It's simpler in some ways, as you don't have half a dozen different companies owning the roads you want to drive your car on that you have to negotiate with in every single country. The biggest hurdle Apple had with the iPhone was dealing with the telcos. If Apple can build a car to government standards, that car is immediately available.
That said, I don't see this happening.
I'm not sure you understand automobile regulations in this country, and in other ones.