I understand they are for temporary duty-free registrations. You should find them on a few "leased" brand new French vehicles, as they are done as a subsidy to French carmakers, on the understanding that it supports tourism, brings income etc. The non-EU-resident visitor legally buys the car, and it is guaranteed to be bought back at the end of the 21 day to 180 day lease period. Also temporarily imported cars. We did this earlier this year in a Peugeot 5008, (through Peugeot Open Europe) very easy, great conditions but not all that cheap. Very worry free, though. That's why all of them are being driven a bit strangely! Late edit: Only four categories are now used : "temporary transit vehicle", "imported vehicle in transit", "pays de Gex vehicle" and "pays de Savoie vehicle" Diplomatic plates are always yellow lettering. Here's more no doubt, than you ever wanted to know....http://plaque.free.fr/f_e.html Here's our leased car near Douarnenez in January this year. [IMG]http://i850.photobucket.com/albums/ab67/kajufastdog/peugeotleaseFeb2012.jpg[/IMG]