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Double-deck elevators are elevators designed such that two elevator cars are attached one on top of the other. This allows passengers on two consecutive floors to be able to use the elevator simultaneously, significantly increasing the passenger capacity of an elevator shaft.
Architecturally, this is important as double-deck elevators occupy less building core space than traditional single-deck elevators do for the same level of traffic. In skyscrapers, this allows for much more efficient use of space as the floor area required by elevators tends to be quite significant.
Double deck elevators are featured in the International Finance Centre in Hong Kong, the American International Building and Citigroup Center in New York, and the Mori Tower in Tokyo.
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