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Generally elevators are available in limited capacities, especially in the public transport systems, e.g. airport. The awkward situation usually happens when “the last person” enters the elevator with the warning tone rings nonstop because of overweight.
To avoid this awkward situation, the idea is to install a pre-signal system -“Anti Awkward Signage” that senses the load of the elevator. The Signage starts with green, while the weight increases, the colour goes to yellow then to red that means full capacity. The system will alarm when it’s overweight. Hence before passengers enter the elevator, they can know about the real-time loading.
Shanghai Art & Design Academy