Improving elevators speed by keying your destination floor!

What are elevator designer really striving for? Saving power, accuracy, not efficiency for the client. Steve  

7 WTC in New York City actually requires that users key in the floor before they take the elevator. Knowing this data ahead of time, the elevator dispatch can optimize the floor scheduling rigorously, minimizing latency, trip length, and power consumption in one fell swoop. More concretely, you can even minimize problems like sending two different elevators to the same floor at the same time. (!!!)source: (2) Home - Quora