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Old 07 December 2017, 08:44 AM
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Don Enrico Don Enrico is offline
 
Join Date: 05 October 2004
Location: Hamburg, Germany
Posts: 7,691
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Coming back to the OP, the way I heard it was that the Romans had their troops pass each other on the left side. Consequently, every nation once under Roman rule - and those that we're influenced by Roman-ruled neighbours - retained the "pass on the left" law - until Napoleon's troops imposed a "pass on the right" law.

Since Britain and Scandinavia weren't conquered by Napoleon, they were driving on the left up until the 1970s (Sweden) or still do (Britain).

But I have no cite for that, and it doesn't explain why, for example, Norway was driving on the right much earlier than Sweden.
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