I think @kattskrall is overreacting to your post. But to be honest, you don't help with what you post. You seem to have a lack of understanding of the automotive industry and you're completely sold on EV's and Tesla in particular. May I suggest you start with understanding the background of some of the topics you're discussing. Starting with the problem that doesn't exist: it's called the Trolley Dilemma. You are right, it doesn't exist per se. It's a thought experiment. It is applicable to autonomous driving. It's an issue that Mercedes has already decided btw.Remember how many times you were faced with this scenario in the last year? In your life? Remember all your family members and friends who faced this scenario? Remember all the celebrities?
This problem DOES NOT EXIST. If you're faced with the scenario where you can hit a pedestrian or a brick wall, the speed limit is 20 MPH. Hitting something or someone will injure them - maybe send them to a hospital. They almost certainly won't die. Unless you're speeding badly.
Let's move on to your 20 mph scenario. Fundamentally flawed. 20 mph collision with a small vehicle? Survival is probably likely. 20 mph collision with full size SUV, Truck, bus, 18 wheeler? Survival is more of a question. This doesn't even take into consideration the type of hit: straight on, offset, etc. or ride height of vehicle. Basically what I'm trying to say is maybe you should avoid blanket statements.
Brakes are mechanical and are actually a system. They are more than just pads and rotors. A failure anywhere within that system can cause catastrophic and sudden failure. I'm not sure where you got that info about an autonomous car detecting defects with the brakes. Even if that was true, a defect in the detection software could render that failsafe useless. Brakes are a wear item. Systems are in place to monitor that wear and detect certain issues. Sudden failure is sudden failure. You can't predict it.With an autonomous car, defects in the brakes would be immediately noticed. The car would demand that it be serviced before driving you anywhere.
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