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The EMI resilience is one of the big reasons why it's used for automotive applications.

Many (all?) CAN standards transmit on redundant copper, in opposing polarities, making it really easy to identify a signal vs noise. https://en.wikipedia.org/wiki/CAN_bus#/media/File:CAN-Bus-fr...

It's like a one-wire serial signal, but redundant.

yeah, differential data lines; common in serial applications where you want to protect from noise. a lot of the higher level dialects are built off something like (if not the) rs485 electrical layer.

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