I often wonder if we ought to try to double the US's highway capacity. It's pretty obvious that the American appetite for public transportation is pretty low, and that car ownership in our continent is here to stay. Why not lean into that, focus on the roads, build bus lanes for public transit?
I remember a long time ago reading an article about the bus system in Curitiba, Brazil, which supposedly was innovative and worked particularly well at a much lower cost than subways, but more efficiently than most buses.