The overwhelming majority of people are probably ok with recording plates at the border. If it's confined to the border it's not really any different than the customs agent jotting down your license plate. It's also not really "tracking", it's just a record created at that single point. It's the whole network that makes it "tracking"
It's the record keeping everywhere else and tracking that that enables that's not ok.
It's the record keeping everywhere else and tracking that that enables that's not ok.