Elevators Amaze Me

Elevator Buttons

How do the up and down elevators never run into each other in the elevator shaft?  You would think that at some point, someone on a bottom floor would push the button for the up elevator at the same time someone on a top floor would push the button for the down elevator.  Either all the elevator riders have gotten very lucky or elevators are marvelous machines.  An up elevator and a down elevator in the same shaft with no recorded collisions?  Incredible.

 

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