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Warehouse robots and people work alongside one another through a combination of task assignment, movement rules, sensing, and safeguards matched to the specific job. Some mobile robots carry goods through areas where workers are nearby; other applications permit closer, controlled interaction. A robot detecting obstacles is only one part of the safety system: the robot, its load and attachments, the workspace, and the way people enter, operate, and maintain the system all matter.
What warehouse robots do—and what “alongside” means
Industrial mobile robots (IMRs) move through a workplace to specified destinations and automate transport tasks. A robot may operate as a single unit or as part of a fleet. A manipulator can also be mounted on a mobile base, creating a system that both travels and handles objects. OSHA describes technologies that help mobile robots identify obstacles in their path; depending on the system, they may use obstacle avoidance or collision avoidance. The broad category of driverless industrial trucks in ISO 3691-4 includes automated guided vehicles (AGVs), autonomous mobile robots (AMRs), bots, and automated guided carts. OSHA’s Technical Manual and ISO’s draft-standard page describe these systems and categories.
“Working alongside” does not necessarily mean a worker and robot cooperate at the same workstation or touch the same goods. It can mean that people and robots use nearby parts of a facility, with safeguards intended to keep them apart, slow or stop a robot as a person approaches, or control a more direct interaction. OSHA explicitly notes that industrial mobile robots can be collaborative or non-collaborative. The application—not the label “robot”—determines what interaction is intended and what protections are needed.
A transport base is also not the entire system. For a particular task, the robot may be integrated with a load, manipulator, end-effector, controls, sensors, fixtures, and surrounding equipment. A hazard can come from any part of that arrangement, or from how it moves through the work area. A transport robot carrying a load therefore should not be treated as equivalent to a mobile robot fitted with a device that grasps, pushes, or otherwise handles materials.
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Three ways people and robots may share work
| Interaction model | What people and robots do | Safety implication |
|---|---|---|
| Nearby work with separation | A robot transports goods while workers perform tasks in adjacent or shared facility areas, without needing to interact directly with the robot. | Safeguards are selected to manage access and movement; applications that do not need direct interaction may use traditional machine safeguarding. |
| Hand-guided control | A worker physically directs a robot using a hold-to-run control. | The control and operating procedure must be suited to the task and the possibility of exposure while the robot moves. |
| Power-and-force-limited operation | The application is designed so contact is expected and safety functions limit forces and pressures. | This is a controlled application technique, not a general guarantee that a person can safely touch any robot or load. |
OSHA defines collaborative industrial robot applications as those “designed for direct interaction with workers.” That definition should not be stretched to cover every robot that shares a building with people. In many deployments, the practical goal is to coordinate movement while avoiding direct contact. Even when an application is designed for closer interaction, its safeguards apply to the specific configuration and task; they do not make every operating condition safe by default. OSHA’s guidance on robot applications describes hand-guided control and power-and-force-limited operation.
How a mobile robot detects and responds to people
Mobile robots use technology to identify obstacles that could impede their path, and may use obstacle-avoidance or collision-avoidance functions. In practical terms, detection can inform how the robot proceeds through its operating area. The system’s response may be part of a protective function, such as slowing or stopping movement as a person approaches. Which functions are appropriate depends on the application and its risk assessment; the available sources do not establish one universal sensor arrangement or response for all warehouse robots.
Obstacle detection is not, by itself, evidence that a complete application is safe. A safety assessment has to account for more than whether a robot can notice an object ahead. The robot’s configuration, load, any manipulator or end-effector, control functions, the operating zone, foreseeable misuse, and the work people do around it can all affect risk. ISO’s draft page specifically notes the importance of operating-zone conditions and includes preparation of the zone within its scope. ISO/DIS 3691-4 addresses driverless industrial trucks and their systems.
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That distinction matters in day-to-day operations. A detection function belongs to a particular system and context; it is not a substitute for deciding where workers may be, how they access a task, what happens if the system stops, or how work is performed when the normal operating setup changes. The safeguard must address the actual exposure, including potential contact with a moving robot or load, rather than assume that detection alone resolves every hazard.
How a facility decides what safeguards are needed
OSHA recommends assessing how the robot application will be used before choosing protective functions. A useful assessment starts with the work, not with a feature list: identify whether anyone needs to be present near the robot, whether a person and robot share a workstation or workpiece, where the tasks occur, how workers get to those locations, and whether contact while the robot is moving is expected. The answers help determine the protective functions and procedures the application requires.
Map the task and possible exposure
- Identify the robot’s job, route or operating area, and the tasks people perform nearby.
- Establish whether workers must enter the robot’s working envelope during normal work, or only during setup, testing, adjustment, recovery, or maintenance.
- Consider the full system, including the payload, any end-effector or manipulator, controls, fixtures, and nearby equipment.
- Consider possible struck-by, caught-between, crushing, or trapping hazards, as well as projectiles from failed equipment or workpieces and electrical or other hazards.
These questions help expose situations that a normal production cycle may not reveal. A robot that appears separated from workers during routine operation can present a different risk when a worker has to reach its work area to set it up, adjust it, or address a problem.
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Select protective functions for the application
OSHA gives examples of protective functions that may be relevant, including protective stops, force or speed limits, position or space limits, and presence-sensing devices. These are not a checklist that every robot must use in the same way. The assessment determines which functions address the hazards and how they need to operate in the particular application. Where contact is not intended, safeguards should not be replaced with an assumption that contact will be harmless.
Make shared-space rules understandable
When people and robots use shared spaces, clear communication can support the engineering safeguards. OSHA identifies delineation—such as a diagram, painted floor lines, or another clear communication method—as an administrative aid. It also identifies entry and exit procedures, worker training, lockout/tagout procedures, and signs. A facility might use marked areas to communicate where access is controlled or where a route crosses a work zone, but the marking method and placement need to fit the site. OSHA’s example of painted lines does not establish a mandated tape type or color.
Markings, signs, and procedures do not make an unsafe setup safe on their own. They help people understand and follow the intended arrangement; they do not replace suitable safeguarding and risk reduction. The same principle applies to training: people need to know how to work around the system, but training cannot compensate for missing protective measures.
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Why safety planning must include setup and maintenance
Robot-related hazards are not confined to routine production. OSHA’s robotics overview highlights programming, maintenance, testing, setup, and adjustment as non-routine conditions in which workers may enter a robot’s working envelope. These activities can change who is near the equipment and what state the system is in. A plan that only describes the normal route or production task therefore leaves important exposures unaddressed.
Facilities should account for how workers access the robot and its operating area when the system is being installed, tested, adjusted, or maintained. Procedures for entry and exit, training, and lockout/tagout are among the measures OSHA identifies. The relevant procedure depends on the task and equipment; a general rule to “watch out for the robot” cannot replace a defined way to control hazards during work inside or near its operating envelope. OSHA’s robotics overview discusses hazards and safety resources, while its Technical Manual covers robot applications and controls.
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Robots can automate transport, but people still perform the work assigned to them around the system. Depending on the application, a worker may carry out a task in an adjacent area, access a shared work zone under defined procedures, or directly guide a robot using a hold-to-run control. A worker may also need to follow site procedures for entering a controlled area or for programming, testing, setup, adjustment, and maintenance. The precise allocation of tasks varies by facility; the sources cited here do not establish a standard warehouse job description or a universal division of work.
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For workers, the useful question is not simply whether a robot is present, but what interaction the application is designed to permit. Workers need to understand where access is allowed, what the operating boundaries and signals mean, how to follow entry and exit procedures, and what process applies when the system needs attention. Those instructions should be specific to the system and work area, and consistent with its safeguards.
U.S. rules and the relevant ISO standard
For U.S. readers, OSHA’s robotics overview states that “There are currently no specific OSHA standards for the robotics industry.” That statement is limited to standards specific to the robotics industry; it does not mean that no workplace safety requirements apply. OSHA provides hazard-recognition and hazard-control resources, and its standards page describes national consensus standards and ISO documents as guidance from their originating organizations rather than OSHA regulations. See OSHA’s robotics overview and OSHA’s robotics standards page.
ISO 3691-4:2023 is the published second edition covering safety requirements and verification for driverless industrial trucks and their systems. ISO’s page for ISO/DIS 3691-4 describes a third edition under development in the enquiry phase and intended to replace the 2023 edition. The draft page includes AGVs and AMRs among its examples. Because draft status and applicable editions can change, employers and integrators should check the current ISO status and determine which requirements apply to their equipment and jurisdiction. ISO 3691-4:2023 and ISO/DIS 3691-4 provide the standard and draft status information.
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Robot type alone is not a sufficient basis for comparing deployments. A practical review focuses on how a system will operate in its actual setting:
- Purpose: Is the system transporting goods only, or does it also manipulate them?
- Interaction: Are workers separated from the robot, nearby without direct interaction, or expected to work in direct interaction with it?
- Response to people: What protective functions detect presence or control movement, and how do they address the assessed hazards?
- Load and attachments: What payload, manipulator, or end-effector is part of the application, and what hazards can it introduce?
- Operating zone: Are the floor and surrounding work area prepared for safe operation, with routes and access points clearly understood?
- Non-routine work: What procedures cover entry, recovery, programming, testing, setup, adjustment, and maintenance?
- Integration: Has the complete application—not just the mobile base—been assessed with its equipment, work area, and human tasks?
These questions help distinguish applications that may look similar but create different exposures. A transport robot in a separated route, for example, presents a different interaction question from a mobile manipulator used where a worker and robot share a task. The answer should come from the complete application assessment, not a generic claim about a robot category.
