Level 4 vs Level 5 Autonomy: A Founder-Grade Explanation
Cut through the marketing. Here is what Level 4 actually means for a Tokyo deployment — and why Level 5 is not a business question yet.
The SAE autonomy levels are the most-misquoted framework in mobility. Understanding them at a founder level is worth the fifteen minutes.
Level 4, in one sentence
The vehicle drives itself with no human intervention inside a defined operational design domain — a specific set of streets, weather conditions, and speeds. Outside that domain, it will not operate at all.
Level 5, in one sentence
The vehicle drives itself anywhere a human could. No commercial vehicle in the world operates at Level 5 today, and no credible timeline puts it inside this decade.
Why this matters for Tokyo
Every relevant Tokyo deployment is Level 4. That is a feature, not a limitation — it makes safety cases tractable, insurance underwritable, and permitting predictable.
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