The Tokyo subway system, mostly built in the 1960s and 1970s, remains one of the most efficient and convenient transportation solutions you'll find anywhere -- not to mention the insane scale at which it operates.
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Building it was an extremely smart investment in the future, that has paid for itself countless times over via the economic growth it has unlocked & the social benefits it has delivered. Large-scale, convenient, efficient public transportation (combined with dense cities) is 
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But but have you seen the tunnel in Vegas?
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Imagine... hundreds of Tesla taxis back to back in a tunnel.
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I have been a bit curious how efficient and useful mass transit interacts with spread of airborne viruses like COVID. I suspect I picked mine up on the metro in Madrid last March. I am guessing good contact tracing and better overall awareness are necessary to offset the danger
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Shanghai metro is also very amazing, similar to Tokyo’s metro, just a newer version.
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Except in a pandemic
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yeah, Tokyo is the highest density urban area in the world, host to about 20 millions people. Thank you for stating the obvious. What's your point?
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Highest density metro is actually Mumbai
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Are dense cities really energy efficient? Many people don’t want to live in dense cities, if not for work. Dense cities are also correlated with hour long commutes and suburban sprawl. It’s time that we look at energy efficiency alone without “economic growth” candy
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Few Americans cannot even conceive of such a convenience nor can they hope for a city with such a marvel. Living in Japan after college was a transformative experience.
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