A lone worker is anyone nobody would notice was in trouble.

The definition, and what it actually turns on

The UK Health and Safety Executive describes lone workers as those who work by themselves without close or direct supervision, in its guidance Protecting lone workers: how to manage the risks of working alone (INDG73). The Canadian Centre for Occupational Health and Safety takes a similar line in its Working Alone fact sheet, framing it as working in circumstances where assistance is not readily available.

Both definitions turn on the same hinge, and it is not distance. It is whether anyone would know.

That is the useful test in practice: if this person had a serious problem right now, how long before somebody noticed, and would that somebody be able to do anything about it? A worker two hundred metres from a busy road can be more alone by that test than a worker forty kilometres out who is expected to radio in every hour.

Three things being a lone worker is not

Most of the confusion around the term comes from conflating it with adjacent ideas:

• It is not the same as remote. Remoteness affects how long a response takes, not whether anyone will notice you need one. A person alone in a building at 9pm is a lone worker.
• It is not the same as dangerous. Plenty of lone work is low-hazard, and plenty of the harm that comes to lone workers comes from ordinary events — a fall, a vehicle problem, a medical episode — that become serious only because they went unwitnessed.
• It is not a permanent job title. Most lone working is intermittent: a crew that splits for an afternoon, a shift that starts before anyone else arrives, one call at the end of a run. People are usually lone workers for part of a day rather than all of a career, which is exactly why it gets overlooked.

The four situations the definition splits into

It helps to sort lone work by what makes it lone, because each one fails differently and needs a different control.

• Alone at a fixed site — a single-staff shop, a small workshop, a control room, a depot with one person on. The location is known; the risk is that a problem there is unwitnessed and the person may be exposed to whoever walks in.
• Alone while mobile — drivers, delivery, service calls, inspections. The location changes constantly, so the first question in an emergency is where they were, and the last confirmed position is the thing worth having.
• Alone outside normal hours — early starts, night shifts, weekend work, being the last one to leave. Others exist at that site, just not now, so the gap before anyone notices can be a whole shift.
• Alone at a remote or dispersed site — survey lines, forestry blocks, ranch country, utility assets, a hunting or guiding party that has split. Both problems combine: nobody sees, and response time is long.

Who this covers in practice

A partial list, written to make the breadth obvious rather than to be complete:

• Surveyors, geotechnical and environmental field staff working separate lines out of one vehicle.
• Forestry, arboriculture, and tree crews working out of line of sight on a property.
• Ranch and agricultural workers on fence lines, water checks, and back paddocks.
• Utility and telecoms subcontractors at rural assets, poles, pits, and cabinets.
• Guides and outfitters whose party has split across a drainage.
• Drivers, couriers, and mobile service technicians between calls.
• Cleaners, security staff, and maintenance workers in buildings after hours.
• Retail and hospitality staff opening or closing alone.
• Home-visit workers — care, social work, inspections, real estate showings.
• And outside work entirely: solo hikers, hunters, anglers, and anyone whose plans only one person knows.

Why the label changes what you have to do

Working alone is generally lawful, and neither the HSE guidance nor the CCOHS fact sheet treats it as something to be eliminated. What both do is ask you to assess it, because a specific safeguard has been removed.

In ordinary work, an enormous amount of safety is unwritten and depends on other people. Somebody sees you climb the ladder wrong. Somebody notices you have gone quiet. Somebody is there to hold the other end, drive you back, or call for help. Remove them and none of it happens — and the plan that assumed it would has a hole nobody wrote down.

So the practical consequence of calling someone a lone worker is that you now owe three answers you did not owe before:

• How will this person stay in contact, how often, and with whom by name?
• What is the maximum time that can pass before their silence is treated as a problem rather than as a quiet afternoon?
• When it is treated as a problem, who does what — and at what point does somebody call emergency services?

What the rules say, and what they do not

Requirements differ substantially by country, province or state, and industry, and some jurisdictions have specific working-alone regulations while others handle it through general duties. Nothing here is legal advice, and the only reliable answer is the one your own regulator gives you.

Below are the sources worth reading first, and then the one thing none of them will settle for you:

• UK Health and Safety Executive — Protecting lone workers: how to manage the risks of working alone, INDG73(rev4). hse.gov.uk/pubns/indg73.htm
• Canadian Centre for Occupational Health and Safety — Working Alone - General, OSH Answers fact sheet, which sets out a worked example of a check-in procedure. ccohs.ca/oshanswers/hsprograms/workingalone.html
• US OSHA — 29 CFR 1915.84, titled Working alone, an example of a sector-specific rule: in shipyard employment, an employer must account for each employee working alone by sight or verbal communication at intervals appropriate to the assignment, and again at the end of the assignment or the shift. osha.gov/laws-regs/regulations/standardnumber/1915/1915.84
• What no source will give you is a number. Check-in frequency, acceptable response times, and escalation thresholds are yours to set from your own hazard assessment.

Where an app fits, and where it does not

A phone app can carry the mechanical part of this: a position shared with the people who would go looking, a timer that asks the worker to confirm they are fine, and an escalation that reaches named people when the confirmation does not arrive. STALKR does those three things, scoped to a Crew the worker joins and can leave.

It cannot carry the rest, and the rest is most of it. It will not do your hazard assessment, decide your check-in interval, train anybody, or choose who responds. It does not detect a fall, it does not contact emergency services, and there is no monitoring centre behind it — an escalation reaches the people you named and then a human being has to act.

Treat the tool as one control inside a written plan, not as the plan. A missed check-in that nobody has agreed to act on is a notification, not a safety system.

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