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Mixed Fleet Operations: AGVs and Manual Forklifts
How to run AGVs alongside manual forklifts: Traffic management, success factors, human factors, and performance expectations for mixed operations.
The Reality: Mixed Operation is the Norm
Almost no AGV project starts in a fully automated, human-free environment. In the real world, automated guided vehicles share aisles, loading zones, and storage areas with manually operated forklifts, often for months or even years after the initial rollout.
Understanding how to make this coexistence work is not a bonus, it is a prerequisite for a successful AGV implementation.
Designing for Coexistence
Mixed fleet planning starts before the first AGV arrives. The core challenge is straightforward: automated vehicles are slower, more predictable, and less adaptable than human-driven forklifts. Your layout and processes need to account for that gap.
Zone Design
Not every area needs the same approach. A common and effective pattern is to define three types of zones:
AGV-Only Zones
Fenced or access-controlled corridors where AGVs travel at full speed without interference. Highest performance.
Handover Zones
Defined areas where AGVs and manual equipment interact, typically at pickup and drop-off points. Both vehicle types enter, but interactions are brief and structured.
Shared Zones
Areas where both vehicle types coexist freely. AGVs slow down, safety sensors are in full protective mode, and throughput drops accordingly.
The more you can shift traffic toward AGV-only corridors, the better the overall system performs. Even partial segregation, like reserving certain aisles during peak hours, makes a measurable difference.
Task Assignment
How you divide work matters as much as how you divide space. Conflicts arise when manual operators and AGVs compete for the same jobs.
Works Well
- AGVs handle repetitive, predictable transport (A-to-B, cyclic routes)
- Manual forklifts handle exceptions, ad-hoc tasks, and complex picks
- Clear ownership: each task type is assigned to one fleet
Causes Problems
- Shared task pools where both fleets draw from the same queue
- Manual placement followed by AGV retrieval (precision mismatch causes jams)
- AGVs handling only a tiny fraction of traffic (seen as obstacles, not tools)
Getting People On Board
The biggest variable in mixed fleet operations is not technology, it is people. This is the aspect most commonly underestimated in AGV project planning.
Why Resistance Happens
Introducing AGVs changes daily routines, and change creates friction. Forklift operators who have done the same job for years may feel threatened or sidelined. This is normal and predictable, not a sign that the project is failing.
The pattern is consistent: in the first weeks, operators and AGVs get in each other's way more than expected. Some of it is accidental (learning to share space takes time), some of it is deliberate pushback from staff who feel their role is being diminished.
What Accelerates Acceptance
The good news: resistance typically fades within the first weeks of operation. What helps:
Communicate Before Rollout
Explain the purpose of the AGVs, what changes, and what stays the same. People cooperate better when they understand the reasoning. A surprise deployment feels like a threat; a planned one feels like progress.
Separate Responsibilities
When operators know their tasks are distinct from AGV tasks, competition disappears. "You handle the outbound dock, the AGVs handle the internal buffer" is a clear message that reduces conflict.
Allow an Adjustment Period
The first weeks will feel slow. AGVs will stop frequently as people learn to share space. Performance improves steadily once operators develop an intuition for AGV behavior and routes.
Show Early Wins
Pick a use case where AGVs clearly add value, repetitive overnight transport or a physically demanding route. Visible success builds support faster than any presentation.
Performance: What to Expect
Be realistic about what mixed operations deliver. AGV throughput in shared environments is always lower than in dedicated zones, and the gap depends on how much traffic they share with manual equipment.
| Environment | AGV Speed | Interruptions | Relative Throughput |
|---|---|---|---|
| Dedicated AGV corridors | Full speed | Rare | High |
| Mostly dedicated, shared handover areas | Reduced in shared areas | Occasional | Moderate-High |
| Shared aisles, moderate manual traffic | Walking pace | Frequent | Moderate |
| Fully shared, dense manual traffic | Below walking pace | Very frequent | Noticeably reduced |
Technology That Helps
A few technology choices have an outsized impact on how smoothly mixed fleets operate:
- 3D sensing (instead of 2D-only laser scanners) catches obstacles that flat scanners miss, like raised forks or overhanging loads, while also reducing false stops.
- Dynamic safety fields that shrink and grow based on vehicle speed and direction keep the AGV moving as fast as conditions allow, rather than always assuming worst case.
- Fleet management with manual vehicle awareness, using transponders or positioning systems for manual forklifts, lets the fleet manager anticipate conflicts instead of only reacting to them.
Conclusion
Mixed fleet operation is technically feasible and practically unavoidable in most AGV projects. Success depends less on technology and more on thoughtful zone design, clear task separation, and honest communication with the people who work alongside the machines. Set realistic performance expectations, allow time for adjustment, and invest in the human side of the transition. The facilities that do this well see a smooth ramp-up; the ones that skip it struggle with an automation project that never quite reaches its potential.