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Afaik the key differentiator of a L3 and a L2 system is that if you don't take control when the system requests you to, the L3 system can safely stop/pull aside while all bets are off with an L2 system.


You remember wrong. That's the difference between L3 and L4.

The L2/L3 difference is that with L2 you have to supervise at all times and you have to decide to take control.




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