Great post, but it doesn't really mention that subway systems and light rail systems could be built in some of those cities that are currently without decent tr

Great post, but it doesn't really mention that subway systems and light rail systems could be built in some of those cities that are currently without decent transit. I've spent time in Houston, too much of it in a car, and it's a city that could definitely use more transit systems than the small light rail system that it currently has. I live in a European city where transit systems except old busses and trams were absent until a few years ago, and where a metro system has been built and expanded over the last decade or so. When a new metro station is about to open, office buildings and high-rises are built in its vicinity. Nobody is suddenly selling their McMansion to move to an apartment near a metro station, but their kids might, divorced people might, people moving in from other cities might etc. It's a slow process but let's not forget that urbanization from villages to cities happened in a few decades and a lot of "densification" from suburbs to cities could happen in a few decades as well.