Level is used where space is a big constraint. There is only one Entry/Exit point located at ground level. Cars are normally parked on the platforms below ground in upto 5 levels. In special conditions platforms can be at upper level also. An elevator carrying a platform carries the car from Entry level to parking platform level or in reverse way. Platforms slide to left or right depending on less retrieval/parking time. There is another elevator that facilitates the movement of platforms to park or retrieve the cars.