I don't get Musk's math on this one. Even if the tunnels were significantly cheaper than building new freeway lanes, a tunnel is a single lane, with single ent

I don't get Musk's math on this one. Even if the tunnels were significantly cheaper than building new freeway lanes, a tunnel is a single lane, with single entry and exits. Ingress and egress overwhelm any gains from potential speed improvements in the tunnel. Besides this, it doesn't matter how much improvement in traffic capacity is gained from tunnels, or lanes. Induced demand always renders improvements in capacity moot over the longer term.