> With multiple elevator shafts there's even more things to think about. Could one shaft serve a lower set of floors while another shaft serves a higher set of

> With multiple elevator shafts there's even more things to think about. Could one shaft serve a lower set of floors while another shaft serves a higher set of floors to minimise 'wasted' time travelling up and down Yes. This is done, that is they start from bottom floors and then just don't stop at lower floors. Thus not needing to accelerate or deaccelerate. One more fun trick is double decker cars. That is one deck of elevator only stops at even or odd floors. This being easiest way to double capacity.