So to get from where it is to a “no private vehicles” utopia thre isn’t that much more to do. Probably as tramways on roads that will now be closed to cars. So not that expensive. But a couple more subways for some links that need more volume would probably be needed.
@farbel @HiddenLayer555 Not much more, PT already moves more people than private vehicles around NYC: https://a816-dohbesp.nyc.gov/IndicatorPublic/data-explorer/walking-driving-and-cycling/?id=2415#display=summary
So to get from where it is to a “no private vehicles” utopia thre isn’t that much more to do. Probably as tramways on roads that will now be closed to cars. So not that expensive. But a couple more subways for some links that need more volume would probably be needed.