We had to try and come up with a solution to create a interface for a 5000 floor lift. We decided to create a lift with 4 doors to try and deal with congestion, and also 4 interfaces aswell. We decided to come up with a keyboard design that you can type in the number for the level that you want. Then there is a screen above the door that shows all the users which floor is next and where theres is in the list.