But it's really not. Level 4 will require the vehicle to take you from door to door without driver intervention in normal driving conditions. Level 4 is mostly what people think of when they think of autonomous driving because you can take a nap, work on your laptop, whatever. You get in your car, tell it where you want to go, and it does everything.
Level 5 basically removes the steering wheel so you never drive. But once you're at level 4, almost all of the hard problems have been solved.
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