> If you have two sensors, one says everything's fine but the other says you're about to crash, which one do you trust? Neither. You stop the car and tow it to

> If you have two sensors, one says everything's fine but the other says you're about to crash, which one do you trust? Neither. You stop the car and tow it to the nearest repair facility. (Or have a human driver take over until the fault is repaired.)