@taxiguy: don't think that. Japanese car-freaks are very interested in high-priced classic cars from Europe and America. Several of them visit events like that:
http://www.siha.de/ to buy and export classic cars. They are looking for the most expensive ones.
As TRT_BMT_IND has said, the export of used cars around the world is a really big business.
About used Japanse cars in New Zealand. When I've been there 10 years ago, one day the port of Auckland was totally empty - the next day filled with freshly imported used cars. All kind of cars, from a tiny Subaru up to buses and construction-machines.
In other RHD-countries you can find used cars from Japan, too, for example in Britain and Ireland (they even have a special license-plate-size for them).
In Russia, too. Recently I've read, that the majority of cars in Sibera are RHD, because imported from Japan.
Actually, with the weak US-$, it's interesting to export classic cars from the US to Europe. It was done in the early 90ies, too, but it was getting less, when the $ was higher. Now it's attractive again. To Germany the dealers ship sometimes classic muscle-cars or big Cadillacs, but mainly old Mercedes, Porsche, VW Karmann Ghia and British roadsters. Mainly car, where the most of the production was exported to the USA, for example Volvo 1800, Porsche 356 or Austin Healey 3000.
Germans take cars, which are older than 30 years (because of the cheaper classic-car-registration), guys from Holland prefer cars older than 25 years (then they are tax-free).
And for sure, the export out of Europe is extreme big. In Germany 80%(!) of the used cars weren't crushed in the shredders here, they went to the export!
A lot of cars go to Eastern Europe, Russia, Bulgaria and so on. Because the direct import to Russia is not allowed, the cars were brought to Lithuania and Latuvia and then smuggled into Russia.
I'm living close to a Autobahn in West-East-direction - every day I see lots of trucks wit Lithuanian plates loaded with used cars from Germany, Belgium, France and even from Britain (RHD doesn't matter, it seems) direction Eastwards.
Rougher cars, expecially Japanese, Mercedes, Peugeot Diesel, jeeps, small vans and trucks were brought to Africa (these are the trucks in the other direction).
And the export of big trucks and buses is a big business, too. In Germany there are nearly no trucks and buses to find on junk-yards! I guess, that 95 to 99% of them were exported.
So you will find trucks and buses with old German company-logos in the deepest africa, in Afghanistan and somewhere else.
At my vacations 1993 on Corfu/Greece I had to smile, when I was lying at the beach and in the background an old smaller Mercedes truck was passing. It had a logo from a very popular beer of my home-area on the side and even the company-name of the distributor.
One day we made a one-day-trip from there to Albania. The bus, we were travelling in, was originally used in my home-town. The logos and stickers were still existing. I wasn't sure, but it could be, that around 10 years ago, with exactly that bus, we had made a school-excoursion.
Because the local taxes in Europe are still different, it can be attractive to buy a new car in annother european country. They are called "Euro-Re-Import".
)
What is the point of this? Why would there be such a law? I would say 95% of people never drive their cars anywhere close to their top-speeds! The only way you could even legally do that is if you went to a race track! (though I suppose if you were in certain European countries you could just drive on one of the "no-limit" freeways 
