My very first post here!
Interesting item in The Atlantic that raises a question for me: http://theatln.tc/2gEXe0A
The first time I drove in Europe, I rented a car in Amsterdam and dropped it off in Paris, a block inside the Périphérique. I wouldn't do that again - the international drop-off doubled the cost - but I'd absolutely rent again and it's perfectly conceivable I could find myself passing through Paris (or some place else with particular local legal requirements) in a foreign-plated car.
I'd expect rental companies in and around Paris to be aware of this and get their cars the needed badges, but farther out in France, let alone in neighboring countries, can you expect rental companies to stay on top of this sort of thing? It would also apply to (for example) France's have-a-breathalyzer-in-the-car requirement (which I knew about somehow but didn't comply with on that trip...I couldn't find one before I crossed the border) or Germany's "Umweltplakette," which is an environmental thing similar to this Paris rule, I believe....
(Administrators, if an appropriate thread exists, please refer me to it, merge this in, whatever you do.... I didn't see one.)