Every lone worker safety system has one thing in common: it needs a mobile signal to work.
Duress alarms, GPS tracking, welfare check-in apps, panic buttons. These are all critical controls for protecting people who work alone. But when the mobile signal drops out inside a building, underground, or in a shielded area, these systems go silent at exactly the moment they're needed most.
This article covers what lone worker safety involves, what Australian employers are legally required to do, and why reliable indoor mobile coverage is one of the most overlooked controls in any lone worker safety plan.
A lone worker is anyone who carries out work activities without close or direct supervision from other people. The isolation can be physical (working in a remote location), temporal (working outside normal hours), or structural (working alone inside a larger building).
Under Australian WHS legislation, the term used is "remote or isolated work," defined in Regulation 48 of the Model WHS Act as work that is isolated from the assistance of other persons because of location, time, or the nature of the work.
Lone workers are found across nearly every industry:
The common thread is that if something goes wrong, help isn't immediately available. That's what makes lone work a specific safety concern under Australian law.
Safe Work Australia has identified that lone workers face a higher risk of harm and a lower chance of receiving timely assistance when incidents occur. The absence of nearby colleagues means there's no one to witness an injury, call for help, or intervene during a threatening situation.
The risks include:
When a lone worker is injured or incapacitated, there may be no one aware of the situation. The time between the incident and when help arrives is the single most critical factor in outcomes, and for lone workers, that gap is often longer.
Workers in client-facing roles, especially in healthcare, retail, social services, and property management, are at elevated risk of verbal abuse, threats, and physical violence when working alone. The absence of witnesses or colleagues can embolden aggressors.
A worker experiencing a medical event (cardiac arrest, a severe allergic reaction, a fall resulting in concussion) while alone may be unable to call for help themselves. Without a functioning communication system, the incident may go undetected.
Lone workers are often in parts of a building or site that carry additional risk: plant rooms, rooftops, basements, underground car parks, and loading docks. These areas are frequently the same places where the mobile signal is weakest.
In Australia, the duty to protect lone workers sits squarely with the Person Conducting a Business or Undertaking (PCBU), which in most cases is the employer.
Under Section 19 of the Work Health and Safety Act 2011, a PCBU must ensure, so far as is reasonably practicable, the health and safety of workers while they are at work. This obligation applies to all workers, including those working alone, remotely, or in isolation.
The model WHS Regulations specifically address lone work under Regulation 48, which requires a PCBU to:
The requirement for "effective communication" is not optional. It is a specific, enforceable obligation. If the communication system doesn't work, the PCBU is not meeting this requirement, regardless of what technology has been purchased or installed.
WHS regulators expect employers to ensure that lone workers can reliably contact their supervisor, a colleague, or emergency services at any point during their shift. This includes being able to:
All of these depend on a functioning mobile or wireless connection at the point where the worker is located.
Here's the problem. An employer can invest in the best lone worker safety technology available, duress alarms, GPS-enabled apps, automated check-in systems, and wearable panic buttons. But if the worker is in a part of the building where the mobile signal is weak or non-existent, none of it works.
It's common in exactly the environments where lone workers are most likely to be:
A lone worker safety system that depends on cellular connectivity is only as reliable as the signal in the space where the worker is standing. If the signal fails, the safety control fails with it.
This isn't just a technology problem. It's a compliance gap.
Regulation 48 requires the PCBU to provide a system of work that includes "effective communication." If a lone worker safety device can't connect because there's no mobile signal in the basement, the communication system is not effective for that location. The employer hasn't met the regulatory requirement.
A risk assessment that identifies lone work as a hazard, selects a duress alarm as a control, but doesn't verify that the alarm can actually transmit from the worker's location has a gap in its control framework. If an incident occurs in a dead zone and the alarm doesn't fire, the employer's exposure is significant. The fix isn't a different alarm, but rather making sure the signal is there for the alarm to use.
In-building coverage (IBC) systems are designed to deliver a reliable mobile signal into the parts of a building where the external network can't reach. For lone worker safety, this means ensuring that every area where a worker may be alone, including basements, plant rooms, car parks, and back-of-house zones, has sufficient signal for safety devices and communication systems to function.
Asignal booster captures an existing outdoor mobile signal, amplifies it, and redistributes it indoors through internal antennas. For buildings with specific dead zones in lone worker areas, a signal booster can be a targeted, cost-effective solution.
For larger buildings, multi-level sites, or premises with widespread coverage gaps, aDistributed Antenna System (DAS) delivers engineered mobile coverage across the entire premises. A DAS uses a network of internal antennas connected to a central system, ensuring a consistent signal throughout the building, including the areas where lone workers operate.
Both approaches support all major Australian carriers (Telstra, Optus, and Vodafone) and ensure that cellular-dependent safety systems, including duress alarms, GPS tracking, welfare check-in apps, and voice calls, work reliably from every part of the building.
If your organisation has lone workers operating inside buildings, the following steps will help close the gap between your safety systems and your actual coverage:
Identify every area of the building where workers may be alone. Include basements, car parks, plant rooms, stairwells, loading docks, storage areas, and any space accessed outside normal hours.
Don't rely on carrier coverage maps. Test the actual signal strength (ideally RSRP values) at the specific locations where lone workers spend time. If the signal is weak or absent, the safety system can't be relied on in those areas.
Check whether your lone worker safety devices depend on cellular connectivity, Wi-Fi, satellite, or a combination. If they rely on cellular, confirm that the signal at each lone work location is strong enough to support the device.
If gaps exist, a professionalsite assessment will identify exactly where the signal fails, what's causing it, and what solution will deliver reliable coverage. This assessment can feed directly into your WHS risk assessment and provide documented evidence that communication controls are effective.
WHS compliance requires demonstrable evidence that risks have been assessed and controls are in place. A site assessment report, coverage heatmaps, and post-installation verification provide the documentation that supports your duty of care obligations.
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MobileCorp is an Australianin-building mobile coverage specialist. We work with employers, property managers, and safety teams to identify and resolve indoor coverage gaps that affect lone worker safety systems.
From site assessment through to installation and carrier alignment, we deliver ACMA-approved signal boosters and DAS solutions that ensure your communication and safety controls work everywhere your lone workers operate, not just where the signal happens to be strong.
If you have workers operating alone in areas with poor mobile coverage, we can help you close the gap between your safety policy and your coverage.
Speak to a Coverage Specialist