The drive in rack is also known as the drive through rack,which is suitable for the storage of less large quantity of the same kinds of goods.The space utilization rate is extremely high and the use cost is relatively low. Into the shelf without a dedicated channel, deposit first by the internal storage of the goods,in order to store again,and at the time of shipment by external goods out first,and then to pickup,called the "advanced".Into the type of shelves design principle is to connect the number of traditional shelves,no special aisle its configuration mode can be divided into two groups into type rack installation and a single set of back to back against the wall,a forklift in and out of all use the same aisle.The storage density of the drive-through shelves is very high,but not "advanced first out".Specifically applicable to the storage of standard cargo units.