Which cities' transit cards interfere with each other?

Upvote:0

The city of Boston, MA, US uses a system called CharlieCard, and the city of Pittsburgh, PA, US calls their system ConnectCard, but both apparently work on the same standards and will interfere with each other if carried or used together.

Upvote:6

Pretty much every card follows the standard ISO/IEC 15693 or ISO/IEC 14443 which means they operate on 13.56 MHz and will potentially interfere with each other. You might be lucky here or there but in general any two contactless cards will cause interference.

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