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When we take the elevator, normally we don’t have a clear idea on whether the elevator will reach the maximum load if several more people come in. Many people try to squeeze in the elevator the minute the door opens. It brings a lot of potential safety risks. The Gravity Sensing Zone plays a vital role in “Full or not” sensing system. And this zone interconnects with the sensors inside the elevator. The total weight imposed onto the two Gravity Sensing Zones is calculated real time. The colors projected onto the sensing zone tell people whether there is any vacancy in the elevator, thus preventing accidents from happening.