Rotterdam — a city with a population of around 650,000 — has both a metro and a tram system. Extraordinary density is not a prerequisite.

And in any case, there's no reason that public transit needs to be self-funded. We don't expect the same of most of our other public services.

Rotterdam has 3,000 people per square kilometer. Contrast that with the San Francisco bay peninsula's ~1,100 people per square kilometer.

This is demonstrating my point about population density and transit.

The peninsula might not be dense, but San Francisco has a density of 7,194/km2 and the transit situation pales in comparison to Rotterdam's.

There are many urban areas in the US with population density of 3,000/km2 or higher that do not have any public transit at all.

	▲	Manuel_D 3 days ago \| parent [-]
		People in the thread are asking why people ride Waymo to SFO, which is well outside San Francisco proper. Thus, the whole peninsula's density is what's relevant. The US does not have many metro areas with population densities above 3,000/km2. And those that do, like Washington D.C, NYC, Boston, Chicago, do have metro systems.