Never understood places with no front plate requirement, how does that work visiting a place where front plates are required?
As I noted in another thread (after your comment was posted), it's covered by the Equal Powers clause: the (US) states are assumed to have equal powers and must respect the exercise of those powers by other states. The two-plates versus one-plate situation is no different than, say, differing requirements for obtaining a driver's license, or a marriage certificate.
That's why eloping couples used to go to Las Vegas to get married, by the way: Nevada had few requirements and short waiting times for a marriage license, and other states had to honor Nevada marriages.
Like any Constitutional requirement, the Equal Powers clause isn't absolute, and there's a history of jurisprudence you have to take into account. And, obviously, there have been periods when various states disagreed fairly vigorously about certain policies. So for some questions it's more complicated than others. But the front-license-plate thing is basically a non-issue.
Biting the hand that feeds IT
