I can't say I like the idea of being tracked, but your vehicle already has at least one ID tag that is easier to read at range - the registration plate. Coupled

I can't say I like the idea of being tracked, but your vehicle already has at least one ID tag that is easier to read at range - the registration plate. Coupled with other identifying tag you are likely to be carrying (e.g. WiFi MAC addresses - I know at least one bank in the UK uses this to measure branch visit numbers), this doesn't seem like a big deal (from a privacy standpoint at least).