Re: Non tesla driver here
Rubbish. Think about how you stay on the road sometime. If all those things fail YOU are going off as well. What if you suddenly go blind or have a stroke. Hey, same result.
The processes I listed were my understanding of how I stay on the road through less than ideal conditions. There are likely more, but they build What a hierarchical process that gives different weights to different types of data and rejects or adjusts if there are contradictions.
My point was that the behavior I see reported from self driving vehicles seems like it relies most on things like lane markers that go totally awry when the highway department gets involved, so the way the vehicle determines position and navigation may need a rethink.