The amended Heavy Vehicle National Law took effect on 1 August 2026, but one of its most significant changes has received surprisingly little attention outside compliance circles.
Under the amended law, a person must not drive a heavy vehicle on a road while impaired by fatigue or otherwise unfit to drive.
Being “unfit to drive” can involve physical illness, injury, stress, mental illness or another condition affecting a person’s ability to drive safely.
The reform applies in the states and territories participating in the HVNL: Queensland, New South Wales, Victoria, South Australia, Tasmania and the ACT. Western Australia and the Northern Territory remain outside the national law and operate under their own domestic frameworks.
Few people would dispute the basic principle.
If someone is medically incapable of controlling a heavy vehicle safely, that person should not be driving.
But the practical questions become much harder once we move beyond the obvious cases.
How does an operator know that a driver is unfit?
What information must a driver disclose?
How should stress, grief, anxiety or medication be handled?
When does an ordinary health problem become a transport safety risk?
And how can an operator meet its safety duties without attempting to diagnose its employees?
More than fatigue
The existing HVNL already places extensive obligations on operators and drivers to manage fatigue.
The new provisions make it clear that a driver may be unsafe for reasons extending beyond work and rest hours.
A driver could be compliant with every work and rest requirement in the book and still be unfit because of illness, injury, medication or psychological distress.
For drivers, the new duty is straightforward in principle: do not drive if a condition is affecting your ability to operate the vehicle safely.
The changes also support a driver’s right to stop when they believe they cannot continue safely.
That is important in an industry where drivers can face pressure from delivery schedules, customers, dispatchers, payment arrangements and their own determination to finish the job.
The message is that commercial pressure must not override safety.
But the changes also create questions for employers and other Chain of Responsibility parties, which must manage foreseeable safety risks within their transport activities.
Where transport and employment law collide
One of the first questions operators are likely to ask is: “How can I make sure a driver is fit if they do not tell me what is wrong?”
That is where transport law begins to overlap with employment, privacy and anti-discrimination law.
Employment, privacy and anti-discrimination requirements can also apply, and the details depend on the worker’s status, the jurisdiction and the circumstances.
Workers do not automatically have to disclose every diagnosis or detail of their medical history. But they may need to provide enough information to establish that they can perform the role’s inherent requirements safely or to enable a reasonable safety response.
Employers should not assume the HVNL duty gives them unrestricted access to a worker’s medical information or permits automatic exclusion because of a disability or manageable condition. Decisions should be tied to the role’s inherent requirements, the actual safety risk and the applicable employment, discrimination and privacy law. Individual cases may require legal or medical advice.
The practical answer is unlikely to involve operators becoming amateur doctors.
For HVNL purposes, a central question will be whether the business had reasonable systems, recognised warning signs and acted when a genuine risk became apparent.
Following an incident, investigators may ask:
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Did the business have a fitness-for-duty policy?
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Were drivers told what they were required to report?
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Could a driver declare themselves unfit without being punished?
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Were supervisors trained to recognise and escalate concerns?
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Did the operator act on information it already possessed?
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Was medical clearance obtained when reasonably required?
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Were decisions and actions documented?
An operator cannot respond to information it could not reasonably have known.
But it will be much harder to defend a business that ignored an obvious warning, discouraged reporting or pressured a visibly unwell driver to continue.
The grey areas will test the law
Some situations are relatively clear.
A driver suffering a heart attack, serious respiratory distress or severe medication side effects should not continue driving.
But what about a migraine?
What about grief after the death of a family member, anxiety following a traumatic incident or significant stress caused by problems at home?
What if a driver slept poorly because of a sick child, despite being technically compliant with regulated rest requirements?
What if medication carries a warning that it “may cause drowsiness”, but the driver has taken it for years without experiencing that side effect?
These situations may not produce a simple yes-or-no answer.
Under the HVNL definition, the central question is whether the person is of sufficiently good health or fitness to drive the heavy vehicle safely at that time.
The NHVR has published guidance on the new obligations, but further guidance, practical experience and eventually court decisions are likely to determine how the provisions operate at the margins.
Will roadside officers assess medical fitness?
Another concern is whether authorised officers will effectively become roadside medical assessors.
They are not doctors and should not be expected to diagnose complex health conditions during an intercept.
However, officers must still respond when a driver appears unable to continue safely.
That could involve observations about the driver’s behaviour, coordination, speech, alertness or physical condition, together with information provided by the driver and the surrounding circumstances.
The difficulty is that appearance does not always equal impairment.
A driver could have a lifelong speech impediment, cerebral palsy, Parkinson’s disease, multiple sclerosis, facial paralysis, a prosthetic limb or another stable condition that affects speech or movement.
Those characteristics might initially resemble intoxication, fatigue or an acute medical episode to someone meeting the driver for the first time.
But speaking or moving differently does not automatically make a person unsafe.
Many people with disabilities and chronic medical conditions legally hold heavy vehicle licences after satisfying the applicable medical standards.
The question must remain: can this person operate the vehicle safely today?
It should not become: does this person look or sound different from what the officer expected?
Ensuring officers can distinguish between a stable condition and signs of current impairment will be critical to applying the reforms fairly.
A warning for operators
The new provisions should not be viewed in isolation.
In a separate recent prosecution under the existing Chain of Responsibility framework, an earthmoving company was fined more than $1.2 million after a fatal crash involving a driver with serious health problems.
The case was not a prosecution under the unfit-to-drive provisions, which commenced later on 1 August 2026. However, it demonstrated the potentially severe consequences when a business fails to establish and maintain adequate systems for managing fitness-for-duty risks.
The lesson is that having a policy stored in a folder will not be enough.
A business must be able to show that its system operated in practice.
What operators should do now
Operators should review their systems now rather than waiting for the first investigation under the amended law.
At a minimum, businesses should consider:
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introducing or updating a written fitness-for-duty policy;
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explaining what drivers must report and when;
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using a practical pre-start or self-declaration process;
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establishing a confidential way to report health and medication concerns;
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training supervisors to respond to observable signs of impairment;
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setting out who can remove a driver from duty;
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obtaining medical advice or clearance where appropriate;
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developing suitable return-to-work procedures;
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prohibiting pressure or retaliation when a driver reports being unfit; and
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recording the information considered and actions taken.
The process does not need to require drivers to disclose every detail of their medical history.
In many cases, the information an operator needs is functional: whether the person can perform the job safely, whether restrictions apply and when the situation should be reviewed.
Small operators should not assume these expectations only apply to major fleets with dedicated safety and human resources teams.
A basic, understood and consistently applied system is likely to be far more valuable than a complex policy nobody uses.
Drivers also have a responsibility
For drivers, the message is equally direct.
If you are genuinely unfit, stop.
Tell the operator or scheduler that you cannot continue safely. Provide the information reasonably required to manage the immediate risk and obtain medical advice when necessary.
Do not allow delivery pressure, pride or fear of losing a shift to place you and other road users in danger.
But drivers must also be able to trust that declaring themselves unfit will produce a sensible safety response—not automatic punishment.
If businesses want early disclosure, they must create a culture in which drivers feel safe enough to speak.
The real test has started
The objective behind the reform is sound: safer drivers, safer workplaces and safer roads.
Its success, however, will not be determined by the words in the legislation alone.
It will depend on how sensibly operators build the requirements into their businesses, how honestly drivers communicate, and how consistently regulators and enforcement officers apply the law.
The hardest cases will not be the obvious ones.
They will be the migraines, medication concerns, disabilities, mental-health episodes and personal crises where fitness cannot be assessed using a simple checklist.
Those cases will require evidence, sound judgement and common sense.
The 1 August commencement was not just another compliance date. It marked the beginning of a much broader conversation about what fitness to drive means—and how far operators can reasonably be expected to go in managing it.
Chris Smith is a transport communications specialist, journalist and industry analyst with more than 25 years’ experience across Australia’s freight, logistics and commercial vehicle sectors. He has worked in transport media, industry, government and the National Heavy Vehicle Regulator, translating complex regulatory and operational issues into clear, practical information for industry audiences.