A somewhat-milder equivalent would be a law that requires you to have a personal ID number visibly affixed to both your front and back at all times outdoors. S

A somewhat-milder equivalent would be a law that requires you to have a personal ID number visibly affixed to both your front and back at all times outdoors. Sure, it's tradition, but license-plates started being required over a hundred years ago and the tradeoffs and dangers were not the same.