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Lorry Driver with Sleep Apnoea: Risk to Fitness to Drive Assessment Explained

13 September 2026 · Health at Work · AI-assisted draft

Photo: Mathias Reding / Pexels

When a lorry driver is diagnosed with sleep apnoea, or when the condition is suspected, the question that follows is immediate and practical: can this person still legally and safely drive a heavy goods vehicle? A fitness to drive assessment answers that question — but the process is more specific, and more consequential, than many employers and drivers realise. This article explains what the assessment involves, what risks obstructive sleep apnoea poses behind the wheel of a lorry, and what both employers and occupational health teams need to do when a professional driver is affected.

Why Sleep Apnoea Is a Specific Risk for Professional Drivers

Obstructive sleep apnoea (OSA) is a condition in which the upper airway repeatedly collapses during sleep, causing the person to stop breathing momentarily — sometimes hundreds of times a night. Each episode briefly wakes the brain, preventing restorative sleep. The result is chronic, often profound daytime sleepiness, even when the person believes they have slept a full night.

For most workers, excessive daytime sleepiness is a wellbeing and productivity concern. For a lorry driver operating a vehicle that may weigh 44 tonnes and travel at motorway speeds, it is a potential cause of catastrophic collision. Studies consistently show that drivers with untreated moderate-to-severe OSA have a collision risk significantly higher than non-affected drivers — estimates in the research literature place the elevated risk at between two and seven times higher, depending on the severity of the condition and the driving task involved.

Heavy goods vehicle driving compounds the underlying risk in several ways. Long-haul shifts mean sustained periods of monotonous motorway driving — exactly the conditions under which a drowsy driver is most likely to fall asleep at the wheel. Night driving, irregular schedules, and time pressure further suppress the alertness that an already sleep-deprived driver cannot afford to lose.

What a Fitness to Drive Assessment for a Lorry Driver Actually Involves

A fitness to drive assessment for a professional driver with suspected or confirmed sleep apnoea is not a single test. It is a structured clinical and occupational evaluation that draws on several sources of information.

The occupational health clinician will typically review the driver's sleep history, including reported snoring, witnessed apnoeas, and the pattern of daytime sleepiness. Standardised tools such as the Epworth Sleepiness Scale are used to quantify subjective sleepiness, though the clinician will also probe for situational sleepiness — episodes of drowsiness specifically while driving, stopped at traffic lights, or during monotonous stretches of road.

Physical assessment includes body mass index, neck circumference, and blood pressure — all markers associated with OSA risk. A formal sleep study, either conducted in a sleep clinic or via home oximetry or polysomnography, confirms the diagnosis and grades the severity of the condition using the apnoea-hypopnoea index (AHI). An AHI below five is generally considered normal; moderate OSA typically falls between 15 and 30 events per hour; severe OSA exceeds 30.

For professional drivers holding a licence for heavy goods or passenger-carrying vehicles, the threshold for clinical concern is lower than for ordinary drivers. The occupational health assessment must consider not just whether the driver currently meets the licensing authority's medical standards, but whether the condition — treated or untreated — creates a residual risk that makes continued driving unsafe.

Treatment and the Return to Driving Decision

The key clinical distinction in a lorry driver sleep apnoea assessment is between untreated and adequately treated OSA. A driver with moderate or severe untreated sleep apnoea will, in most jurisdictions, not meet the medical standards required to hold a professional driving licence. The licensing authority's medical panel or the occupational health physician providing the fitness certificate will typically advise the driver to cease driving pending treatment and review.

The most effective treatment for OSA is continuous positive airway pressure (CPAP) therapy — a mask worn during sleep that maintains airway patency by delivering pressurised air. When used correctly and consistently, CPAP eliminates most apnoea events, restores normal sleep architecture, and substantially reduces daytime sleepiness within days to weeks. Research shows that adequately treated drivers with OSA return to a level of crash risk comparable to unaffected drivers.

The phrase 'adequately treated' carries specific meaning in the driver context. The occupational health assessment will not simply ask whether the driver has a CPAP machine — it will ask whether they are using it. CPAP adherence data, downloadable from modern devices, shows the number of hours used per night, the residual AHI on treatment, and any mask leak issues. A driver using CPAP for fewer than four hours a night, or showing a high residual AHI on treatment, cannot be considered adequately treated and cannot be certified as fit to drive on that basis alone.

Other treatments — weight loss, positional therapy, mandibular advancement devices — may be appropriate for mild OSA or as adjuncts to CPAP, but their efficacy in moderate-to-severe cases is generally insufficient to meet the standard required for professional driving certification without additional evidence.

What Employers Must Do When a Driver Discloses or Is Suspected of Having Sleep Apnoea

An employer who becomes aware that a lorry driver may have sleep apnoea has a duty of care that goes beyond simply referring the worker to a doctor. The employer must take the risk seriously, act promptly, and document what has been done.

The immediate steps are these. First, the driver should be referred to an occupational health service with experience in fitness to drive assessments — not a general practitioner alone, and not left to self-manage. Second, if the driver is reporting severe daytime sleepiness, episodes of falling asleep at the wheel, or has been involved in an incident that may be fatigue-related, the employer should consider whether it is appropriate for that person to continue driving until the assessment is complete. Removing someone from driving duties is a difficult conversation, but it is the kind of decision that duty of care requires.

Third, the employer must communicate clearly with the driver about confidentiality, the assessment process, and the difference between a fitness report (which the employer receives, stating fit, unfit, or fit with conditions) and the underlying medical detail (which remains confidential to the clinician and driver). Drivers who fear losing their job may conceal symptoms — and a culture where disclosure is safe is the employer's most practical tool for early identification.

In most jurisdictions, professional drivers also carry a personal legal duty to inform the relevant licensing authority if they are diagnosed with a condition that may affect their fitness to drive. Employers should make sure drivers understand this obligation, but the duty lies with the driver, not the employer.

Common Misunderstandings About Sleep Apnoea and Lorry Driver Fitness

Several misconceptions delay appropriate action on both sides of the employment relationship.

• OSA is only a problem for overweight drivers. While obesity is the strongest single risk factor, sleep apnoea affects drivers across the weight range. Neck anatomy, age, gender, and alcohol use all contribute. A driver of normal weight with a large neck circumference and habitual snoring is still at risk and still needs assessment.
• A driver who feels fine cannot have dangerous OSA. Many people with severe OSA adapt to their chronic sleepiness and no longer recognise it as abnormal — they describe themselves as 'just tired'. The Epworth score may be surprisingly low even when the AHI is very high. Objective evidence from a sleep study matters more than subjective report.
• Starting CPAP means an immediate return to driving. It does not. The occupational health clinician needs to see adherence data — typically several weeks of consistent use — before certifying a return to professional driving. Some frameworks require a minimum period of documented treatment before reinstatement, regardless of how well the driver says they feel.
• This is a medical issue, not an employer issue. Employers of professional drivers are responsible for managing the occupational health of their workforce. A lorry driver with undiagnosed or inadequately managed sleep apnoea represents a foreseeable risk. Failing to act on that risk, once it is known, exposes the employer to serious liability in the event of a collision.

The Role of Occupational Health in Managing the Process

Occupational health services sit at the centre of the fitness to drive assessment process for professional drivers, and their role is different from the role of any other medical practitioner involved. A GP will diagnose and treat the condition; a sleep physician will interpret the polysomnography and manage CPAP titration. The occupational health clinician applies those clinical findings to the specific demands of the job — the hours, the vehicle type, the route profiles, the regulatory standard that applies to the licence held — and produces an opinion on fitness to work in that role.

For lorry drivers with sleep apnoea, that opinion must be grounded in both clinical evidence and an understanding of the driving task. An occupational health service that works regularly with transport operators will have established protocols for CPAP adherence review, will know the medical standards that apply to professional driving licences, and will be able to advise employers on reasonable adjustments during the assessment and treatment period — reduced hours, supervised routes, or temporary redeployment — rather than presenting a binary fit-or-unfit conclusion that leaves both driver and employer without a path forward.

What to Do Next

If you are an employer with a lorry driver who has been diagnosed with sleep apnoea, or whose pattern of fatigue, near-misses or reported symptoms raises concern, the starting point is a formal occupational health referral to a service experienced in professional driver assessments. Early referral protects the driver, protects other road users, and gives the employer the documented, defensible basis for any decisions about duties that follow.

If you are a driver who has been told you may have sleep apnoea, or who recognises the symptoms — waking unrefreshed, daytime sleepiness that is hard to explain, a partner reporting that you stop breathing in your sleep — the right action is disclosure and assessment, not concealment. Treated OSA carries no long-term barrier to professional driving. Untreated OSA on a motorway carries consequences that cannot be undone.

Health at Work provides occupational health assessments for professional drivers, including fitness to drive evaluations for workers with sleep apnoea and other medical conditions that affect safe vehicle operation. Assessments are carried out by experienced occupational health clinicians and include structured CPAP adherence review where required.