Are Autonomous Cleaning Robots Safe Around People? The Compliance Checklist

Autonomous floor cleaners can run safely around people when they're specified and supervised correctly — and not when they're not. Part of that is the machine: a robot like the PUDU MT1 tops out at 1.2 m/s, and our catalogue records the PUDU range as LiDAR + VSLAM navigation with 3D obstacle avoidance. The larger part is on you — the risk assessment, the signage, and knowing which questions to ask before you sign. Here's the checklist.

General information only — not legal or WHS advice. Work health and safety duties differ by state and by site. Confirm yours with your WHS regulator or a qualified adviser, and verify any machine's safety behaviour with the vendor's own documentation before you deploy it.

What the machine actually brings

The instinctive worry — a robot barrelling into a shopper — is the opposite of how commercial cleaners are built. Two things are genuinely published, and one is not:

• Slow by design. The MT1's top speed is 1.2 m/s (~4.3 km/h), below the typical adult walking pace of about 1.3–1.4 m/s. A 65 kg machine at walking pace carries a small fraction of the kinetic energy of anything on a forklift chassis. This one is a published spec.
• Sensing, in outline. Our catalogue records the PUDU range as LiDAR + VSLAM navigation with 3D obstacle avoidance — one line, applied across the range rather than measured per model. The intent is that a person, trolley or dropped box is detected before contact, not by a bumper after it. But note the level of detail: that is an outline of what is on board, not of how well it performs. No sensing coverage angle, no detection range and no stopping distance appear in any spec sheet we hold — so anyone quoting you a "360°" figure for this machine is quoting something else, and any claim about how the sensors are combined is a question for the vendor, not something we can confirm.
• What it does next is not published. How a given robot behaves after it detects a person — how hard it slows, whether it stops or steers around, what it does when it loses localisation — is not in any spec sheet we hold. Treat it as an open question for the vendor, covered in the checklist below.

The behaviour to specify before you buy

Detection is only step one. What the machine does after detection is what keeps a daytime deployment incident-free — and it is the part no brochure spec answers. Use this sequence as the acceptance test: ask each vendor to confirm every step in writing, then watch it happen on your own floor.

That last step is worth pushing on: if a machine records its stops, blockages and coverage — and lets you export them — it feeds your due-diligence file every shift. Logging depth varies a lot between vendors, so confirm it rather than assuming it.

Noise is a safety factor too

Around people, how loud a machine runs decides when you can run it. Don't reason by class here. The quietest figure in our catalogue belongs to a dry vacuum-sweeper — the CenoBots SP50 at 58 dB, below every scrubber we hold a figure for — though that row is flagged unconfirmed, and the two loudest machines are also dry. The honest read is that the data is too thin to support a class rule in either direction, so check the published number model by model. Compare the actual published numbers, and match the machine and the hour to the space. If you're cleaning an occupied area in the daytime, a quieter unit earns its place; a 75 dB sweeper is better saved for after-hours logistics floors.

The standards landscape (and who's really liable)

In Australia your obligations start with work health and safety law — but check which Act actually applies to you, because it is not uniform. Most jurisdictions run the model law, but not under one name: it is the Work Health and Safety Act 2011 in the Commonwealth, NSW, Qld and the ACT, the Work Health and Safety (National Uniform Legislation) Act 2011 in the NT, and the WHS Act 2012 in South Australia and Tasmania. Western Australia adopted a modified version as its WHS Act 2020, and Victoria alone never adopted the model laws — it operates under the Occupational Health and Safety Act 2004, which frames the duty around the employer rather than a PCBU. Whichever applies, the principle is the same: the business conducting the work carries a primary duty of care that a robot cannot transfer. Buying an autonomous machine doesn't outsource your responsibility; it changes the job from pushing a mop to supervising a system.

On the product side, the standard actually written for this machine class is IEC 63327 (automatic floor treatment machines for commercial use), which covers autonomous operation and is applied alongside IEC 60335-2-72 (floor-treatment machines). Locally, AS/NZS 4024 is the machinery-safety series — voluntary unless a regulation or your contract calls it up. You may also see ISO 3691-4 cited — that one governs driverless industrial trucks, so it's adjacent rather than on-point for a floor cleaner. No single sticker proves a robot is "compliant" for your site: compliance is your risk assessment plus the machine's built-in safeguards, together.

The pre-purchase safety checklist

Skip the brochure adjectives. These are the questions that predict a safe deployment — ask every vendor the same list and compare the answers:

The honest takeaway

One thing about the MT1 is genuinely verifiable from a published spec: at 1.2 m/s it travels below walking pace. Don't generalise that to the category — the Gausium Omnie, Mira and Marvel are all rated to 1.4 m/s, at the top of it — so check the top speed model by model. One more thing follows from how these machines work rather than from any datasheet: an unattended machine doesn't get distracted or rush the last aisle at 2am. Everything else — how it reacts to a person, what it does when it gets lost, what it records — you have to make the vendor put in writing and show you.

And "the robot is safe" is only ever half the sentence. The other half is your risk assessment, your signage, and real human oversight — and how much of that your site needs is an output of your risk assessment, not of anyone's calculator.

If you want a starting point for an occupied daytime floor: shortlist on the published noise figure first (70 dB or quieter), confirm the top speed model by model, and make the response sequence above a written condition of sale.

• Size a right-fit fleet for your site with the Fleet & ROI Planner — it sizes on throughput and cost, and makes no compliance assessment.
• Or tell us about your site and we'll send a vendor-neutral shortlist with the published speed, noise and IP figures laid out — and the questions above ready to put to each vendor.