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Good idea, but probably can't be relied upon given liability issues (in addition to the whole "print wrong barcode and sabotage restaurant with crashing cars thing).

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I doubt a malicious map would be allowed to override the car's basic collision avoidance, however it would be a serious nuisance.

"paste a wrong barcode over the restaurant's one in the middle of the night & redirect cars to the competitor just down the road", then? :P

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