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Drive-thru storage systems, with two different entry points, use a FIFO (first in, first out) storage method. With FIFO rack systems, pallets are loaded at one end and placed back to the other, where they are then at the front of the row on the opposite side; the first pallet put into such a row is the first one taken out at the other end. Drive-thru racking is advantageous for material with an expiration date or wherever shelf life is a major concern. Drive-thru is similar to drive-in racking, except that the back is left open and not against a wall, so that fork trucks can pass completely through the structure.