4DP uses 4 platforms driven upwards and downwards in a group of 2 platforms each. 1st and 2nd level platforms make a group and similarly, 3rd and 4th level platforms also make a group. Car parked on 2nd level platform has to be driven out and parked elsewhere while taking out car parked on 4th level platform. 1st, 2nd and 3rd level cars can be driven out independently.