This type parking system:
Upper platforms just do up-and-down movement and move down to ground level to let autos in and out.
Ground platforms just do cross-sliding movement, and among ground platforms there is a vacant position to make room for upper platform's moving down or underground platform's moving up.

Underground platforms just do up-and-down movement and move up to ground level to let autos in and out
Before equipment should be traffic lane to let autos in and out