In the building in which I work, there are three elevators, two passenger and one freight, all in a row. There is a set of up and down call buttons next to the freight elevator, and another set between the passenger elevators. Sometimes the buttons by the freight elevator work for all three, and other times not. I haven’t found a pattern to it; it doesn’t seem to be based on time of day, or on any special usage.
The bigger mystery, though, is why they were designed such that the lights indicating whether the elevator is going up or down do not light up until a few seconds after the doors open. Why shouldn’t they either be on continuously, or turn on when the doors start to open?
What I want to know is whats up with the green light under escalators. I suspect that it may be a portal to another dimention where the escalator magicly returns to the other end.