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Stop lights might want to have some 1-n beacon protocol available for automated cars, and vending machines likewise might want a way to expose what's currently in stock and allow sufficient verbs to pay by a phone app.

These don't necessarily need to be the same system, only one might need interactivity, but there's certainly a case to be made that both devices could reasonably want to communicate with passers-by.




The traffic lights communicating with vehicles automated or not is sinister. That would get attacked ASAP, DoS or otherwise, and crashes would happen. A vending machine provides a keyboard interface for making selections. You can integrate NFC to it and require the payment in between the selection and dispensing. Allowing automated connections to public devices is not a useful idea.




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