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Both of those situations are one where policy could be changed to solve the problem with relative ease. Transportation construction crews would actively put up markers and other signs to make routes clear to self driving vehicles. A side effect would be that it would probably be more clear to human drivers as well.

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Basically, I'd expect an AI system to be able to go into swarm mode without clear markings.

How else do they ever want to work in egypt, or around the arc de trioumpe(sp?) in paris?

Swarm mode can still happen with clear markings. I assume the vehicles don't have a dedicated swarm mode, more like they try to do lane keeping but the distance and road keeping algorithms override that. If not, a "great" practical joke would be to paint lane markings that run off the side of the road. It's just like any piece of software, you cannot trust any external input, not even road markings.

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