And I'm sorry, but as someone who lives in a smaller city and outside city limits where it's more affordable, driving to a city, paying to park, taking a bus or train to go to another city and taking a bus to get where I need to go in that city is expensive and wastes loads of time and money. What you want only works if you live in a big city (which costs loads more) and can do everything you need to do almost all the time while staying in that city. Highways are also a requirement no matter what for commercial transport and time sensitive needs. You think things like emergency organ donations have time to take a train without a highway? Or ems transport for patients?