I disagree. Most of America’s car-first city infrastructure was set up remarkably quickly during short bursts in the 1930s and 1940s, depending on which city you’re talking about. We just don’t think about how remarkably fast it happened, because it’s outside of living memory.

Undoing some of this infrastructure should be an easier process than setting it up; bikes take less space, asphalt, and steel than cars do.

I should have said "the US, today?"

In the 1940s the United States was able to mobilize into a war economy in months. Today we are incapable of manufacturing medicine and surgical masks.

It absolutely happened quickly back then. There was money to be made and a capable leadership class. We are now led by their incapable grandchildren. The smart money is seeing strong returns in Silicon Valley and Wall Street, and has no interest in long-turnaround you-need-to-know-what-you're-doing stuff like concrete, asphalt, and steel.

Just as a medieval peasant had no hope of figuring out how to build a coliseum or an aqueduct, a modern American neoliberal technocrat is entirely un-equipped to engineer, build, or plan much of anything.

That’s fair. It’s certainly possible, but the political will does not exist.