Comment by atoav

Aside from this you may also consider that newer cars are sending out unencrypted but digitally signed data via ITS (in Europe) or DSRC/C-V2X (USA) that potentially anybody with an antenna can collect.

That includes positional data, speed, whether you're pressing the gas pedal or braking etc. Since it is meant as a Car-to-Car solution, e.g. to warn other cars when there is an accident the reach isn't great, but some of the signals (e.g. warning of a traffic jam) may be propagated by other cars.

See this German talk on the European system: https://media.ccc.de/v/glt26-688-c-its-mit-einem-esp32-ampel...

I think they have a English translation or dub somewhere