Drive-in racking is a high-density warehouse storage system designed for products that are stored in large quantities on pallets. Instead of leaving an aisle between every rack row, forklifts drive directly into deep storage lanes supported by steel frames and pallet rails. This saves floor space and increases storage capacity, which matters in cold storage, bulk goods, and manufacturing warehouses where space is expensive.
The tradeoff is that access to individual pallets is more limited than in selective racking.
Key Facts
- Storage density increases when aisle space is reduced: storage density = pallet positions / floor area.
- Drive-in racking usually follows LIFO flow: last pallet in = first pallet out.
- Lane capacity = pallets deep x pallet levels high x lanes wide.
- Required aisle and lane clearances depend on forklift width, turning radius, pallet size, and rack tolerance.
- Load per bay = pallet weight x number of pallet positions supported by that bay.
- Drive-in racking works best when many pallets share the same SKU and rotation speed.
Vocabulary
- Drive-in racking
- A pallet storage system where a forklift enters rack lanes to place or remove pallets from support rails.
- Storage lane
- A deep channel inside the rack where pallets of the same product are stored one behind another.
- Pallet rail
- A horizontal steel support that holds pallets along the sides of a drive-in rack lane.
- LIFO
- Last-in, first-out is an inventory flow where the most recently stored pallet is removed first.
- Upright frame
- A vertical steel rack structure that transfers pallet loads down to the warehouse floor.
Common Mistakes to Avoid
- Treating drive-in racking like selective racking is wrong because not every pallet is directly accessible from an aisle.
- Ignoring forklift clearance is wrong because even small errors can cause rack impacts, product damage, and unsafe operations.
- Mixing many different SKUs in one deep lane is wrong because buried pallets become difficult to reach and inventory rotation slows down.
- Calculating capacity from floor area alone is wrong because usable capacity also depends on pallet depth, rack levels, lane width, and safe load limits.
Practice Questions
- 1 A drive-in rack has 8 lanes, each lane stores pallets 5 deep and 4 levels high. How many pallet positions are available?
- 2 Each pallet weighs 900 kg. A lane contains 5 pallets per level and 4 levels. What total pallet mass is stored in one full lane?
- 3 A warehouse stores one product in large batches and ships the newest pallets first. Explain why drive-in racking may be a better choice than selective racking for this operation.