These systems park cars vertically, one over the top of the other. They require that someone move the car on the ground before letting the car in the air down. This is exactly the same as parking the cars on the ground bumper-to-bumper. Someone must move the cars at the back end of the row to get to the cars at the front end of the row. In the case of parking lots or garages the attendants who collect the money will move the cars. In many cases, like with condominiums, the parking attendants, who move the cars, double as security personnel.

These are the least expensive mechanical parking devices and can be quickly set up and used with little or no foundation work. Most of the two high units can be installed on asphalt while the higher units will need a simple concrete slab or footing. These units can easily be disassembled and move as required.