Drive-in rack and Drive-thru rack are storage rack configurations that allow the forklift to drive directly into the lane of stacked rows (called a bay). The difference between a drive-in and a drive-thru pallet rack system is simply whether the bays have an entry at only one end, or at both ends. Drive-in rack systems use a common entry and exit, while drive-thru systems have entry points at either end of the bay.
Drive-In Rack - Last in First Out (LIFO)
Pallets are stored and picked from the same side. Because of this, the first material placed in this system is the last to come out (LIFO). This is a good solution where shelf life is at a minimum or not a major concern. This system is also typically seen in cold storage environments or warehouse freezers.
Drive-Thru Rack - First in First Out (FIFO)
Drive-thru rack allows access from both sides allowing pallets to be stored from one end and retrieved from the other. With this functionality, a first in first out storage arrangement is made possible (FIFO). This system is commonly seen in the grocery industry, where there is expiration dated material or wherever shelf life is of major concern.