JerryRigEverything

5 million miles with zero fatalities is not evidence of anything. 5 million miles with zero injuries is weak evidence of something. Understanding the difference is most of what you need to read autonomous vehicle safety claims. Tesla says its robotaxi fleet now runs 24/7 across eight cities & has passed 5 million autonomous miles with zero injuries, zero airbag deployments & no pedestrians or cyclists struck. Start with base rates. NHTSA's 2024 figures: 1.19 fatalities and 74 people injured per 100 million vehicle miles travelled. Scale those down to 5 million miles. You'd expect roughly 3.7 injuries & roughly 0.06 fatalities. Which makes the fatality claim empty. If these cars were exactly as dangerous as the average American driver, the chance of seeing zero deaths across 5 million miles is about 94%. You'd almost certainly see zero either way. To expect even one fatality at the human rate you need around 84 million miles. Tesla has about 6% of that. The injury claim is genuinely different. Expecting 3.7 & observing zero carries a probability near 2.5% if the fleet were merely average. That's a real signal. Not proof, but not nothing. Except the comparison population is wrong. That 74-per-hundred-million figure covers every mile Americans drive. Rural two-lane roads after dark. Highway speeds. Ice. Drunk drivers, exhausted drivers, seventeen-year-olds, cars with bald tyres and no automatic braking. Tesla's robotaxis drive inside geofenced urban areas in Texas & Florida, in new vehicles, on mapped roads, in mostly benign weather. Not the same risk population & urban low-speed miles are considerably safer per mile than the national blend. This is solvable & Waymo actually solved it. Their published safety work constructs benchmark rates specific to the areas & road types they actually operate in rather than leaning on the national average. More work, smaller headline numbers. There's a second gap. Tesla hasn't said what share of those 5 million miles were genuinely unsupervised. The Bay Area service still runs with safety drivers & Austin's unsupervised rollout has been described as limited. A safety monitor who intervenes before an incident doesn't produce an incident, so supervised & unsupervised miles aren't interchangeable units in a safety denominator. NHTSA opened an investigation in June 2025 after documented wrong-side driving, phantom braking & drop-offs in intersections. None of it produced injuries. All of it is the kind of event that produces injuries on a different roll of the dice. None of which says these cars are unsafe. They may well be meaningfully safer than human drivers & Waymo's much larger dataset suggests that's achievable. It says 5 million miles is early. Rare events need long denominators & the honest version of this announcement is that the fleet hasn't driven far enough yet for the headline to mean what it sounds like.