This system is adopted as an efficient use of a under ground space of a station, a park and a building and so on.
It is possible to design according to underground spaces of large commercial facilities etc.
There are several system types, like plane shuttled type which has traversers at each floor, and long-lifter type which makes the traverser, the lifter, and the pallet move at the same time.
Therefore, they achieves smooth storing of vehicles in wide underground space.