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What kind of POD would be easiest/most recent in order to have everyone drive on the same side of the road?

Countries that have switched: https://i.redd.it/flto172q2k8z.png

https://www.reddit.com/r/MapPorn/co..._by_which_side_of_the_road_countries/djzcwhr/

Would just stopping Russia driving on the right be enough to stop France taking that idea and so all of Napoleon's Empire being left driving?
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