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4IH uses 4 platforms that are driven upwards and downwards. Dummy platform is placed over the top of 1st platform while the 2nd, 3rd and 4th platforms are below the 1st platform. Tiling can be done or turf can be installed on the dummy platform similar to 1IH. Pit depth required for 4IH is nearly double of that of 2IH. Cars can be parked on 1st, 2nd, 3rd and 4th platforms when they are driven upwards to the ground level. When driven back to their original position, a car can be parked on dummy platform.