Right, that also explains the concepts of 'express' elevators and lobby floors.
Due to the passengers the rate of travel for an elevator is not constant:
* There's a maximum rate of acceleration and deceleration that people are comfortable with.
* A longer travel distance means more time to speed up / slow down.
* Thus an elevator or two which are dedicated to operate at the longer distance travel that distance at a more effective speed and provide more rapid service.
* Even more importantly, it also cuts down on the number of slow elevator shafts necessary to service floors by allowing them to be stacked.
Due to the passengers the rate of travel for an elevator is not constant:
* There's a maximum rate of acceleration and deceleration that people are comfortable with.
* A longer travel distance means more time to speed up / slow down.
* Thus an elevator or two which are dedicated to operate at the longer distance travel that distance at a more effective speed and provide more rapid service.
* Even more importantly, it also cuts down on the number of slow elevator shafts necessary to service floors by allowing them to be stacked.