As a Brit, I find it slightly depressing that the author dismisses out of hand the possibility of classifying vehicles based on their registration (licence plat

As a Brit, I find it slightly depressing that the author dismisses out of hand the possibility of classifying vehicles based on their registration (licence plate) for being too invasive - because of course in London this is the norm (and we can be quite sure the police do indeed compile extensive databases of vehicle movements).