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> accept that you are only safe to the extent that your radios are reliable.

Won't you need to have the same assumption if you had a centralized infrastructure? Otherwise how would your car talk to the centralized system?

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No because a motor vehicle would have to establish a connection to the centralized infrastructure in order to get a green light. If it can't, it assumes a fault and acts accordingly. The problem above is that there might not be another car so how do you detect the failure?

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