alt Hacker NewsSensor fusion allows you to resolve that ambiguity, I wonder if Elon is really as in touch with this as you would expect. No single sensor is perfect, they all have their problematic areas and a good sensor fusion scheme allows you to have your sensors reinforce each other in such a way that each operates as close as possible to their area of strength.
No single sensor can ever give you that kind of resilience. Sure, it is easy in that you never have ambiguity, but that means that when you're wrong there is also nothing to catch you to indicate something might be up.
This goes for any system where you have such a limited set of inputs that you never reach quorum the basic idea is to have enough sensors that you always have quorum, and to treat the absence of quorum as a very high priority failure.
Even if it doesn't allow you to resolve the ambiguity, knowing that there is an ambiguity is extremely valuable. Say the lidar detects a pedestrian but the camera doesn't. Which one do you believe? Well, you propagate the ambiguity and take appropriate action, i.e. slow down, change lanes, etc. Don't drive through an area where there's a decent chance that you're going to kill someone by doing it.