City walls often worked like this on a smaller scale; rammed-earth walls for old Chinese cities were elevated roads for local soldiers.
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Replying to @380kmh
Canals sometimes filled this role too. On a larger scale, rivers were both highways and borders.
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Replying to @380kmh
We don't build walls for our cities anymore, but highways and railways sometimes play similar roles.
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Replying to @380kmh
Route 128 in Boston is the de facto city wall; the notorious Beltway in DC, the M25 in London, Beijing's ring roads, Tokyo's Yamanote Line
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Replying to @380kmh
The point of a wall is that you can't walk across it except at specific access points--gates.
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Replying to @380kmh
I think this principle works at a variety of scales--busy streets form neighborhood walls just like expressways do for metro areas.
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Replying to @380kmh
Naturally I'm most interested in how this works regarding trains. Railways are walls at various scales--"wrong side of the tracks" etc
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Replying to @380kmh
Railway "walls" can have mundane gates in the form of overpasses and underpasses...but they also have that very special gate: the station.
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Replying to @380kmh
Imagine a wall where most gates just take you to the other side, but some gates takes you *anywhere*
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Replying to @380kmh
You walk through the wall and come out hundreds of miles away on the other side. Magical!
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Anyway enough evening rambling from me, bedtime
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