The only reason we have cities with crap density is cars, and their super-wide roads and giant parking lots spreading everything out. So, yes, we can't just put a subway system under Dallas. That's why I said busses first. At the very least stop building more lane miles and making it worse.

Or do keep building more roads. I don't really care. If people love traffic and want to live in their car, there should be a city for them (so long as they are not sucking up federal dollars to do it). The problem is that right now, in NA, all we build are roads. Every city is a shitty carbon copy of the next one. No one is trying anything new.