This is literally what Engineering is, designing the components to spec such that when they fail the failure mode is acceptable. This includes the computers. T

This is literally what Engineering is, designing the components to spec such that when they fail the failure mode is acceptable. This includes the computers. That said, "throttle stuck at previous speed" is not a horrible failure mode, all things considered. If you were driving safely at a certain speed then you should have some time to react and pull the E-break (push the "Park" button on a Tesla). Slowly losing speed until stopping would be better, but there are much worse failure modes too, such as suddenly braking or accelerating.