Why do you think cost per mile would be cheaper than the subway? With CBTC (existing technology, though not rolled out to most of the subway) and intrusion dete

Why do you think cost per mile would be cheaper than the subway? With CBTC (existing technology, though not rolled out to most of the subway) and intrusion detection, we don't need any labor on a subway. What's less expensive to maintain, a 10 subway car set that carries 1500 people or 1500 pods? Maybe paved roads are cheaper to maintain than subway track, but that's hard to really compare apples to apples. Honestly, I find it easier to imagine a NYC where there are no private vehicles allowed at all during rush hour than I find it possible to imagine one w/o subways.