Regents park in London has an inner circle over a hundred years old, it is a perfect circle approximately 1km in circumstance with uneven terrain and lots of trees.
I am sure many other cities have similar large perfect circular roads.
Eli5 How did they ‘draw’ the road on this scale before building it?
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Probably by calculating the curvature at that size and then picking points at the correct distance where it’s possible to line yourself up directly facing the centre point, and build out from there. I’m guessing at the time the ahem trees in the area wouldn’t be particularity high and getting a vantage point to maintain accuracy wouldn’t be that difficult.
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