What is a FIFO Lane and Why Is It Important in Production?

What is a FIFO Lane?

FIFO stands for First In, First Out

A FIFO lane is a controlled buffer area where materials or products move in sequence, ensuring that the items entering first are processed or used first.

It helps maintain production flow and prevents work from accumulating without control.

In simple terms

Imagine Station A produces components for Station B.

If Station B is temporarily busy, components wait in a designated FIFO lane.

When Station B becomes available, it takes the oldest waiting component first.

This prevents newer components from jumping ahead of older ones.

Simple Example

A factory uses a FIFO lane with a maximum capacity of 20 components.

At 10:00 AM, 12 components enter the lane.

Station B consumes 5 components.

Remaining components:

12 − 5 = 7 components

Station A continues producing, but the lane has a defined capacity.

If the lane reaches its limit, the upstream process must follow an agreed response instead of continuing to produce unlimited WIP.

Why Use FIFO Lanes?

• Control work-in-progress (WIP)
• Reduce excessive waiting
• Maintain the correct processing sequence
• Improve traceability
• Make production flow more visible

Important Insight

A FIFO lane is not simply a place to store unfinished products.

It is a controlled flow mechanism with a defined capacity and clear rules for entering and removing items.

If the lane is always full, investigate the downstream constraint rather than repeatedly increasing the buffer size.

How to Implement a FIFO Lane

1️⃣ Identify where production flow becomes interrupted.

2️⃣ Establish a clearly marked lane.

3️⃣ Set a maximum WIP limit.

4️⃣ Define the entry and withdrawal sequence.

5️⃣ Assign responsibility for replenishment and escalation.

6️⃣ Monitor lane occupancy and waiting time.

7️⃣ Investigate repeated congestion.

Benefits

• Better WIP control
• More predictable material flow
• Reduced risk of excess inventory
• Improved production visibility
• Easier identification of bottlenecks
• Better coordination between workstations

Practical Insight

When unfinished products pile up between two operations, don’t immediately add more storage space.

Control the flow, limit the buffer, and investigate why the downstream process cannot keep up.