Imagine for a moment that you have a working self-driving car in the field, and now you want to make a relatively minor change to the system. How do you convin

Imagine for a moment that you have a working self-driving car in the field, and now you want to make a relatively minor change to the system. How do you convince yourself or a regulator, not that the technology in general is safe, but that your specific change does not make it unsafe? What happens if this specific change increases the fatality rate from 1 in 100 million miles to 1 in 50 million miles? Crashes will still be rare and there's enough statistical noise that when you finally understand the change is bad, you may have killed hundreds.