Oh so this is something that is included in most elevators as a precaution. Has saved me alot of time though when i walk into the lobby and i'm almost late for a meeting on the 40th floor. It's a little tricky the way it handles it, but think of it as a first come first serve thing. If you press the floor you are going to and the door close button at the same time it switches the elevator into express mode. Once you are in express mode, it skips all other requests until it gets to the first floor that has a glowing button. Some elevators i have found it seems to work better if you press it twice. Some you may have to hold the 2 buttons for a few seconds. I have had about 90% sucess rates with this though.