After visiting Taipei, I've become a road-width extremist

I used to be fully anti-car, but now I think if you simply make most roads barely 1 car wide and get rid of on-street parking, it gets you 95% of what you want

Taipei has a grid of major 6-8 lane roads through the city, but most inner roads are ~1.5 cars wide and cars go slow and yield to pedestrians on them

Having two different road types provides a nice clarity: the big roads are for cars, but cars are guests on the small roads

Here's a satellite view of near where we were staying. You can see the grid of major roads, but also the tiny interior neighborhood streets

This effect is kind of what Barcelona is trying to retrofit with their superblock project.

Like most US cities, Barcelona is filled with lots of medium-large roads as the default. These are just large enough to be uncomfortable for pedestrians.

But if you can funnel most traffic onto a grid of "major" roads, you can designate the roads within the grid blocks as minor and pedestrian-first.

Since US cities are already built, adopting the Barcelona model is probably the best path forward, but newly-built developments should consider the Taipei model.