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Driving direction in Europe, 1922
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Rules
I assume the traffic just moved slow enough at that point in time that the rule was "make way" when you saw another vehicle rather than "always stick to this particular side".
Again, this is just an educated guess and have absolutely nothing to back up my assumptions.
If you don't know stuff about a topic... how can a guess be "educated"?
"I am educated and this is my guess."
"OK, I may only be educated in underwater basket weaving, but still..."
Now I want to be educated in underwater basket weaving!
Sorry, I'll just present my assumptions as fact next time.
I think the point is that it's just a guess, not an educated guess.