Yeah sure, there&#x27;s all kinds of ways to pack lots of people into a little space and get them marginally close to where they started from and where they need to get to. But there&#x27;s still the first and last legs of that journey. Even in Paris, where no spot in the city is further than 500m from a station, means you may still have to walk a km in the worst case.<p>It&#x27;s fine when holding nothing, now do it with a couple armfuls of groceries or whatever.<p>A car free city eliminates cars, which carry around big empty storage boxes in the back all day, and can go from right where you are to right where you need to go. Bikes are an &quot;ok&quot; solution for some segment of the population, but not for every.<p>A quick example, my 80+ year old father, who walks with difficulty with a cane, would not be able to live in a car free, train only city at all, and bikes are not an option for him for the same reasons. But he still insists on working every day because retirement bored him. There&#x27;s lots of people like my father, old, handicapped, both, how do you design a mass transit system that can accommodate people like him?<p>That&#x27;s why transit systems designed by healthy 20-40 something internet forum people are usually bad ideas, they optimize for these kind of best-case scenarios, but there&#x27;s so many edge cases in humans that these solutions work poorly in general. Cars work well in general, but a terribly many of them in places like NYC are personal vehicles used for just a few minutes a day, adding to congestion.<p>There&#x27;s only ~13k Taxis in NYC and ~40k other for-hire vehicles. What if we doubled those numbers, and killed off all other personal non-business vehicles entirely (the majority of vehicles in the city)? Sounds like that solves pretty much all of the problems.<p>Okay it doesn&#x27;t solve all of the problems, you still have to deal with Taxi drivers.