Color wait / Elevator Design

We must have the same embarrassing experience about rushing into the elevator until the alert of elevator beeps on to tell us that it has been overloaded, so that we have to get out soon with embarrassment.
Color wait is a new design on the elevator. With new identification on entrance of elevator, it will remind users of overload condition of elevator by different colors in advance, so that there won't be happened this embarrassing situation anymore.