Did a little walk to a big intersection, to see what "device signals" I'd find there at 433 MHz.
I could confirm that the IBIS beacons are in fact being sent by buses! The included "vehicle ID" even matches the white number that's printed on it.
I also saw some messages from tire pressure monitoring systems in cars! They also include an ID, and usually, the brand of the car! The owners probably aren't aware how easy it would be to track them…
