> What's the cutoff in last-second button pushes to prevent the elevator from too abruptly stopping? A good starting point might be to have a stopping distance

> What's the cutoff in last-second button pushes to prevent the elevator from too abruptly stopping? A good starting point might be to have a stopping distance table for whatver the definition of "graceful stopping" is. Then, the elevator stops iff at the time the button is pressed, the stopping distance is less than the distance from the top of the elevator to the top of the floor, i.e. it doesn't need to backtrack.