Tower systems typically consist of a vehicle elevator with a parking space either side of the elevator shaft. This configuration is repeated over a number of levels to complete the parking tower. Typically there is a parking module located on the ground floor, where the vehicle is turned, and the vehicle elevator simple raises to one of the parking levels of the tower and deposits the vehicle sideways into a parking space. This process is reversed to retreive a vehicle.
As there is a single mechanism to park and retrieve vehicles system redundancy is an issue with tower systems.
Key: =Low =Medium =High.