[sandworm101]

>> 2,000 people an hour with no room for upgrades without boring more tunnels--on par with a single highway lane

2000 for a typical mixed-use highway lane. A dedicated/managed lane can move several times that number. 50-person buses at two per minute = 6000 people per hour. For sheer people moving potential, things like escalators and moving walkways actually do pretty good. They are just very slow.

[jcranmer]

I should have clarified that 2,000 people an hour assumes ~100% single-occupant vehicles. This does tend to be the norm for highways, unless you're talking specifically about HOV lanes or dedicated bus lanes.