I take that as a very strong piece of evidence that 96% of the time on a very long road trip is spent on roads with near-ideal conditions. It sounds like the trip was mostly on highways. US interstates are wide, straight, and nearly uniformly impeccably painted and signed.<p>4% of the time there&#x27;s inclement weather, ambiguously signed construction, heavy traffic in snow that occludes the entirety of the road, cars stopped in their lane, detours into the lane normally dedicated to oncoming traffic, and all sorts of other low-frequency events that are much harder to solve than keeping a car moving forward on an interstate.<p>I&#x27;d argue that 96% autonomous driving time isn&#x27;t even enough to say we&#x27;re 50% of the way through the challenges of creating an autonomous vehicle. Think twice before accusing me of not understanding percentages.