Answer in brief
Bring robots into a working warehouse as a site project, not a purchase. Decide which standard covers each machine, have the integrator complete a documented risk assessment with the people who work on the floor, separate robot and pedestrian routes and mark the crossings, train everyone who passes through the area, and track stops, interventions and strain alongside throughput.
A shared floor is a different project from a fenced cell
A traditional industrial robot works inside a cage, and the cage does most of the safety work. OSHA’s technical manual describes such non-collaborative applications as separated from workers by conventional machine safeguarding. A warehouse that keeps picking while robots arrive has no such luxury: the machine and the person use the same aisles.
The manual names the two types that matter here. A collaborative application is designed for direct interaction with workers. An industrial mobile robot navigates autonomously to automate transport, uses obstacle or collision avoidance and, unlike a lift truck, is not intended for a seated or standing driver. It can run alone or in a fleet.
NIOSH, the US institute for occupational safety and health, lists the familiar hazards — being struck or caught, crushing and trapping, slips and trips, electricity — and adds newer ones for robots that work close to people: unexpected contact, distraction from other hazards and mental stress. It says these emerging risks may not yet be fully understood. That is the honest starting point for warehouse robot safety.
No single rulebook: which standard covers which machine
No one document settles warehouse robot safety. OSHA’s manual points first to general regulations on machine guarding, lockout and walking surfaces, and then to consensus standards: ISO 10218 in two parts, one for the robot and one for robot systems and their integration, and ISO/TS 15066 for collaborative operation. It notes that standards are revised on a regular schedule and calls the use of current editions a best practice.
Mobile robots sit under a different heading. ISO 3691-4 sets safety requirements, and the means of verifying them, for driverless industrial trucks; ISO’s abstract gives automated guided vehicles and autonomous mobile robots as examples. It states that the condition of the operating zone has a significant effect on safe operation and puts the preparation of that zone in an annex. Trucks intended for public zones are outside its scope.
Two practical consequences follow. A robot arm mounted on a mobile base, a combination the manual describes, should be checked against both families of standard. And editions move: ISO’s catalogue shows the 2023 edition of ISO 3691-4 as due for revision, with a draft successor in development. Ask the supplier which edition each declaration refers to, and write it into the contract.
The risk assessment belongs to the site, not to the brochure
A certificate for the machine is not an assessment of your aisle. OSHA’s manual makes the integrator responsible for completing and documenting a risk assessment before commissioning and for handing the results to the employer, and it recommends involving the workers affected. If the integrator does not train staff on its findings, the employer should.
Each application needs its own assessment, even when the equipment is identical. The manual’s example is exact: one installation stands next to a wall, another next to a walkway, and the hazards differ. In a warehouse the list of such differences is long: a blind corner, a ramp, a dock door, a mezzanine edge, a charging bay beside the break room.
Assess the unusual hours, not only the normal ones. The manual cites studies showing that many robot accidents happen outside normal operation, during installation, programming, testing and maintenance, and it names time pressure as a hazard in itself: people hurrying to restart skip steps. Review the assessment whenever the layout, the software or the task changes.
Traffic rules: separate where you can, mark every crossing
Treat robots as vehicles and the warehouse as a road system. Britain’s Health and Safety Executive states the principle plainly: a traffic route must be usable without danger to the people working near it, and roadways and footpaths should be separate whenever possible. The most effective measure, it says, is to make the routes entirely separate.
Where routes must cross, HSE asks for marked and signposted crossing points with a clear view in all directions, and for barriers at building entrances and corners. It advises laying pedestrian routes along the paths people naturally follow, their ‘desire lines’, so that they stay on them. Inside buildings, signs and floor markings should tell both drivers and pedestrians whose route is whose.
For driverless vehicles the guidance is specific. On routes shared with pedestrians, vehicles must not be able to trap people and should be fitted with safeguards that keep the risk of injury low if contact occurs; clearances must be sufficient, and fixtures along the route must not create trapping points. HSE also suggests restricting vehicles at shift changeover, when many people are on foot.
Stop, slow or touch gently: how a robot may share space
‘Collaborative’ describes an application, not a product. OSHA’s manual lists the techniques that permit sharing. With speed and separation monitoring, sensors detect a person and the robot slows, then stops before contact. With hand guiding, the robot moves only while a worker steers it and presses a hold-to-run control.
With power and force limiting, contact is expected and permitted because forces and pressures are kept below the level that injures. The manual notes that such applications usually run at much lower speeds and payloads than the robot is capable of, and that contact with sensitive regions such as the face, temples and throat is to be prevented. Techniques are often combined: fast when nobody is near, slow when someone is.
This is why the word ‘cobot’ on a quotation settles nothing. The manual’s own footnote says the term only signals that a robot is ready to be used in a collaborative application. Ask whether the gripper and the load were part of the assessment, because a gentle arm holding a sharp-edged box is not gentle, and ask for measured contact forces rather than catalogue values.
Ergonomics after automation: look at the work that is left
Robots are usually justified by the lifting and walking they remove, and NIOSH agrees that they can improve safety and well-being by taking over high-risk work. But automation rarely removes a job whole. It leaves a person at a station where goods arrive, and the design of that station decides whether strain went down or simply moved.
Check three things at every human position. Reach: are items presented within easy reach, or does the person bend and stretch all shift? Pace: who sets the rhythm, the worker or the queue of robots waiting behind? Variety: is there rotation between tasks, or the same movement from the first hour to the last?
OSHA’s manual treats this as part of safety, not comfort: for force-limited collaborative systems, it says, the parameters of power, force and ergonomics are to be determined by the risk assessment. Put the workstation on the assessment agenda, let the people who will stand there try it before acceptance, and treat reports of pain as defect reports. Persistent pain is a matter for an occupational-health professional.
Train everyone who crosses the floor, not only the operators
The people most exposed are often missing from the training list. OSHA’s manual says workers who program, operate, maintain or repair robots should be trained before assignment and able to demonstrate competence. It then adds a line warehouses tend to miss: awareness training for employees who have nothing to do with the robot but pass its perimeter, and it gives housekeeping and warehousing staff as examples.
Awareness training can be short if it answers real questions. Where may I walk, and where never? What does the robot do when it detects me, and what do its lights and sounds mean? What do I do when one stops in my way, and who is allowed to move it or reset it? HSE adds visitors and new starters to the audience: explain the routes before they reach the floor.
Write the unusual procedures down. The manual asks for written procedures at least for tasks done in a fixed sequence and for those with unusual hazards, including start-ups, shutdowns and emergencies, and for control of hazardous energy during maintenance. One of its accident examples shows why: a contractor cleaned a sensor while the system was in automatic mode, the sensor cleared, the robot resumed and the worker was struck.
Beyond throughput: the numbers that show whether the floor works
Throughput tells you whether the robots are fast. It does not tell you whether the floor works. Count protective stops and where they cluster, the times a person had to free, move or restart a robot, routes blocked by pallets or parked machines, and near misses reported by staff. A zone with many stops is telling you that people and robots want the same space.
Add the human measures. NIOSH names distrust of the robot’s capabilities and concern about job loss among the stresses of working near robots, and neither appears on a dashboard unless somebody asks. A short, regular question to the people on the floor, read together with records of strain and absence, shows whether the change is being absorbed or merely endured.
Keep verifying the safety functions themselves. The manual says employers remain responsible after acceptance and suggests periodic tests of stopping performance and safety distances, checks that safety settings have not changed, and a record of every test. Start with one zone, define these measures before the first robot runs, and expand only when they have held through a peak season.
Practical checklist
- List every machine and note the standard and edition its supplier declares, separately for arms, collaborative applications and driverless trucks.
- Require a documented risk assessment from the integrator before commissioning, with floor staff taking part, and repeat it when the layout changes.
- Draw robot and pedestrian routes on one plan, separate them where possible, and mark, sign and light every crossing point.
- Give awareness training to everyone who passes through the robot area, including cleaners, contractors, visitors and new starters.
- Agree before go-live which stops, interventions, near misses and strain reports will be counted, and who reviews them each month.
Questions and answers
Which safety standards apply to warehouse robots?
It depends on the machine. Industrial robot arms and their integration are covered by ISO 10218, collaborative operation by ISO/TS 15066, and driverless industrial trucks, including automated guided vehicles and autonomous mobile robots, by ISO 3691-4. National workplace law applies on top. Standards are revised, so confirm the current edition in the ISO catalogue and ask suppliers which edition their declarations use.
Are collaborative robots safe to work beside without guarding?
Not automatically. OSHA’s technical manual treats collaboration as a property of the whole application, including the gripper and the load, and says the limits on power and force are to be determined by a risk assessment. A robot sold as a cobot is only ready for collaborative use; whether your task is safe without fencing is a conclusion of the assessment, not of the brochure.
Who is responsible for the risk assessment of a robot installation?
According to OSHA’s manual, the integrator is responsible for completing and documenting the assessment before commissioning and for giving the results to the employer, and both should involve the affected workers. The employer remains responsible for a safe workplace afterwards, which includes reviewing the assessment after changes and keeping the safety functions tested. Other countries allocate these duties in their own law, so check locally.
How should robot routes and walkways be separated in a warehouse?
Follow the principle used for any workplace transport: separate routes wherever possible and, where they must cross, provide marked and signposted crossing points with clear sight lines. HSE guidance adds that driverless vehicles on shared routes must not be able to trap pedestrians and need adequate clearance. Lay walkways where people actually walk, or they will not be used.
What should a warehouse measure after introducing robots?
Alongside throughput, track protective stops and their locations, manual interventions, blocked routes, near misses, and reports of strain or stress from the people working near the machines. Add periodic tests of stopping performance and safety settings. Together these show whether people and robots are sharing the floor or competing for it, which output figures alone cannot show.