Bluetooth? You're overthinking this. We've been mandated to carry 4-5 transmitters per vehicle broadcasting their UIDs at 315 MHz since the mid 2000s:
https://en.wikipedia.org/wiki/Direct_TPMS
I have an SDR in a facility that is a public parking lot. It picks up TMPS incidentally and I'm definitely able to track individual vehicles.
I have an SDR in a facility that is a public parking lot. It picks up TMPS incidentally and I'm definitely able to track individual vehicles.