Agreed. Zero tolerance (or 100% reliability) necessarily has infinite cost and&#x2F;or takes infinite time. We need to be reasonable about our expectations for autonomous systems.<p>That said, what&#x27;s the likely accident rate for a 95th percentile human, starting in a parked car, hitting another stationary vehicle parked directly in front of them? There must be a few &quot;accidentally put it in drive instead of reverse&quot; type incidents but I&#x27;d except it to be exceedingly rare.