Comment by Someone

I would think that elevator has less capacity than a tunnel entry would have. The video compensates for that by having multiple such elevators, closely spaced, that presumable share an on-ramp. I'm not convinced that gives you enough capacity, because each car being lowered on that on-ramp blocks traffic for quite a while.

Also, entering this system leaves a big hole in the street where the carriage was. Before another car can enter, a new carriage must be brought up from below. That decreases capacity even further, except for the ideal situation where that carriage always carries a car. In the less than ideal sitautin, there's the added problem of getting that replacement carriage in place at just the right time (for example, at the end of the day in a business district)