Except in places where land is very expensive, for example, Tokyo or NYC. In addition these systems can be used to good effect in auto manufacturing. BMW has o

Except in places where land is very expensive, for example, Tokyo or NYC. In addition these systems can be used to good effect in auto manufacturing. BMW has one for finished vehicles; the GM plant I worked at in Arlington TX has one for painted bodies. Throughput is definitely an issue; in the manufacturing system I worked with, a vehicle could be stored or retrieved in about 1 minute; but these are uniform size and shape, and are not finished products. 6 minutes seems like a very long time, unless you have an app to pre-retrieve your vehicle. Also I wouldn't care to design one for all of the various types and sized of vehicles.