What is the real difference between Level 3 and Level 4 autonomy?

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Do autonomous shuttles work in snow and heavy rain? Can a self-driving truck platoon save fuel without raising crash risk? Do lidar and camera-only stacks actually differ in safety? Dead reckoning in a tunnel: why the blue dot drifts and then snaps back What does V2X actually let a car do that sensors alone cannot? How does an autonomous car handle a four-way stop with a confused pedestrian? Self-driving cars: how close are we really? Are self-driving cars actually safe? How autonomous vehicle sensors work What happens when a robotaxi stalls at an intersection with nobody inside?