I had heard that the Japanes were thinking of changing from left-side to right-siade - and sent an offical delegation over to Sweden to observe their change-over in the 1960s. The fact that Japan still drives on the left tells you what they thought od that, maybe! I also undersand that the reason why Volvo cars (and many marques since) have daytinme driving lights is also because of the Swedish change over. It was originally the case that cars had to drive with lights on for several months after the change-over and they decided they liked it as a general road safety meaure.
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