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Two Call Buttons are used outside the Elevator to determine which Direction you'll be going and to avoid the elevator reach maximum capacity by putting request calls on HOLD by preventing to halt on floors where the person wants to travel an opposite direction. Take this scenario, for example: There are 10 floors in a Building. The Elevator is on the ...


The purpose of the two call button (up and down) was based on the elevator algorithm, used in aiding the efficiency of transportation (https://en.wikipedia.org/wiki/Elevator): Continue traveling in the same direction while there are remaining requests in that same direction. If there are no further requests in that direction, then stop and become idle, or ...


it is an interesting question and this article: http://blog.jgc.org/2010/06/elevator-button-problem.html gets to tackle this question.

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