The driver sets the speed. Unless the autosteer determines that it is on a two lane road with no central reservation or other divider in which case it restrict

The driver sets the speed. Unless the autosteer determines that it is on a two lane road with no central reservation or other divider in which case it restricts the speed to the speed limit plus whatever margin the user has set. It never increases the speed beyond what the user has set. At least that's how my 2015 S 70D with AP1 (1.5?) works. And it's pretty reliable. I think I have driven about 30k km in the last 18 months and I must have had autosteer on for close to half of that. It misbehaves a little on the kinds of roads that Tesla says it is unsuited for but still the car and I drive better together than either would alone. Where anyone who actually drives a Tesla would get the idea that you could sleep while the car drives I can't imagine. The configuration screen where you enable it makes it perfectly clear that this is a driver assistance function that requires the driver to be able to take control. And every time you enable the function with the steering column stalk it reminds you in the dash to keep your hands on the wheel. Yachtsmen sleep while on autopilot but that kind of autopilot is considerably less capable that Tesla's and is only safe while in the open sea away from busy shipping lanes, ditto aircraft. As far as I know commercial aircraft require at least one pilot to be awake and in the seat in the cockpit at all times whether or not autopilot is on.