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Speaking of limits... "The 1.42 billion cars on the road in 2018 need a set of new tires about every 2 years, or 2.84 billion tires annually, and those 2.84 billion tires consume over half of the earth's rubber production, which of course burns even more fuel and cause even more pollution."
Now multiply that with the number of tires on additional individually owned cars from wealthier people in the emerging economies.
And think ahead, if you can, to the year 2050 and 10 billion people alive, many of which might be climate [war] refugees but most will hopefully live in agreeable circumstances. The limit is: the planet's resources and the inhabitable and agriculturally workable land.
Megacities, they're a given by 2050, need different transport concepts for goods and people. By 2050, 85% of the population will live in cities and go about their business from A in suburbia to B and from B to C and so forth. Better to envision sustainability and a sustainable level of quality of life than to backward focus into a tunnel.
That future starts today. With genius engineers who can think out of the 4 wheeled 2-seater box.
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