It makes sense to me with Bluetooth because the sound system and device are connected. But when it’s regular radio, how is it receiving and displaying this information?
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This is only possible when the car’s radio is a DAB+ (Digital Audio Broadcasting) compatible device. Sending data digitally across the radio spectrum enables (among other things) *data casting*, which is the inclusion of additional information about what is being broadcast. Notably, there are DAB+ compatible radios that are standalone devices too, not just used in cars.
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