1. When headroom is severely restricted.
2. Rows of sliding platforms are placed on rails on
   existing ground.
3. Each row is directly behind the one in front.
   
4. All spaces can be entered independently
   without the co-operation of another driver.
   
5. Many more spaces are achieved by placing row
   behind row and reducing the number of driving lanes.
6. No excavation or engineering work required -
   the system is placed on existing ground.
   

Manufacturer's Details

See animation below.