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But it does offer a reasonable hybrid solution: the software in the car doesn't have to solve all possible scenarios, it just has to be good enough to navigate the common, easy scenarios and should always be able to safely handle any situation for a short window of time, even if "handle" means "come to a quick safe stop within X seconds and turn on the hazards", all the while it's already starting the process of asking for remote assistance to take over whatever tricky situation, hopefully before the local code actually reaches the emergency-stopped case.