What is the height limit of the underground garage?

Generally, small cars and mini-cars with a height of 2.2 meters are parked in residential areas, and the specification requires a clear height of 2.2 meters. Clear height means that there are no obstacles, pipes, decorative surfaces and parts in this range. The minimum underground garage is 2.2 meters, the normal height is 3 meters, and the air-raid shelter is 3.6 meters, 1.95 meters, which definitely can't meet the national requirements.