Something that seems like a good idea to me is the following.
Tesla has about 30,000-40,000 cars on the road with Autopilot hardware. What if, during this time, they were able to create a map of all the highways that people are on (which would include most of the highways). The map would tell them where Autopilot is okay to use, and where it is not. Then, when you put a destination into your NAV, it gives you a route overview on where you can use Autopilot, and where you cannot. As you approach an area where you cannot use Autopilot, it gives a countdown at 2 mins, 1 min and 5 seconds until you take over.
What do you think?