Neuropsychological correlates of driving ability in older drivers

Driving supports independence, social connection and access to healthcare for many older Australians. It also places complex demands on attention, visual processing, memory, executive control and rapid decision-making. A person may perform well on a brief cognitive screen yet struggle when traffic conditions become unpredictable.

The relationship between brain health and road safety is therefore more nuanced than a single diagnosis or test score. Neuropsychological assessment can clarify how cognitive ageing, stroke, dementia, medication effects and reduced processing speed influence real-world driving behaviour.

This issue has particular relevance in Australia, where older people may drive across large distances for medical appointments, shopping or family commitments. Residents in outer Melbourne, Sydney and Brisbane can face heavy traffic and unfamiliar motorway layouts, while people in regional areas may have few practical alternatives to the car.

The 2018 International Neuropsychological Society meeting in Prague highlighted the value of connecting neuroscience with humane clinical care. That principle remains useful when clinicians assess older drivers: the goal is to identify risk accurately while preserving dignity, mobility and informed choice.

Cognitive systems behind safe driving

Driving depends on divided attention, sustained vigilance and the ability to shift focus between mirrors, signs, pedestrians and other vehicles. Executive functions help drivers inhibit impulsive actions, plan several steps ahead and adapt when a familiar route is blocked. Processing speed becomes especially important at intersections, roundabouts and merging lanes.

Memory also contributes to safe navigation. Drivers need to retain temporary instructions, recall road rules and recognise familiar landmarks. Visuospatial skills support lane positioning, judging gaps and estimating the speed of approaching vehicles. Weakness in any single area may be compensated for during quiet daytime trips, but compensation can fail in complex traffic.

Brain changes and driving behaviour

Age-related changes in white matter can slow communication between brain regions, affecting mental flexibility and reaction time. White matter hyperintensities are common in later life, but their functional impact varies according to volume, location and coexisting vascular disease. Research on the cognitive impact of WMH helps explain why imaging findings should be interpreted alongside cognitive and functional evidence.

Stroke, Parkinson’s disease, traumatic brain injury and neurodegenerative conditions may produce different driving profiles. A person with mild memory impairment might become lost, while someone with frontal-system dysfunction may underestimate hazards or make unsafe decisions. Visual field loss, slowed motor responses and sleepiness from medicines can further alter performance.

Assessment beyond a screening score

Brief tools such as the Mini-Mental State Examination or Montreal Cognitive Assessment can identify areas requiring closer review, but they do not directly measure on-road competence. A careful assessment includes medical history, medication review, vision, motor function, mood, sleep, cognitive testing and reports from family members or carers.

Where appropriate, an occupational therapist specialising in driver assessment can combine off-road testing with a practical evaluation. This may reveal problems that are missed in a clinic, including poor mirror use, delayed responses, lane drift, confusion at unfamiliar intersections or difficulty managing multiple instructions.

Australian clinical and legal context

Australian licensing requirements differ by jurisdiction, although national medical standards provide a common framework through Austroads and the National Transport Commission. Doctors may need to report a condition when required by state or territory rules, while licensing authorities can impose periodic reviews, vehicle modifications, geographic limits or conditional licences.

In New South Wales, Victoria and Queensland, older drivers may encounter different renewal processes and medical review expectations. Clinicians should check current state guidance rather than relying on assumptions. A recommendation to stop driving can have major consequences where public transport is limited, particularly in outer-suburban Adelaide, regional Western Australia or rural Queensland.

Everyday driving and access to alternatives

Driving patterns provide important context. An older person who travels short distances to a local supermarket during daylight may present a different level of risk from someone who regularly drives between regional towns, uses busy Sydney arterial roads or undertakes long trips on the Hume Highway. Self-regulation can reduce exposure, but it should not conceal serious impairment.

Family discussions are often difficult because driving represents autonomy and identity. A graduated plan may include avoiding night driving, limiting unfamiliar routes, arranging community transport or sharing trips with relatives. Australia’s expanding rideshare market can help in major cities, although cost, smartphone access and rural availability remain uneven.

Practical assessment priorities

Clinical decisions are strongest when cognitive results are linked to observed behaviour and the person’s usual driving environment. Collaboration between neuropsychologists, general practitioners, occupational therapists, families and licensing bodies can support a fairer judgement than any isolated test.

Useful recommendations for an individual review include:

• Examine attention, processing speed, executive control, visuospatial ability and memory together.
• Ask about near misses, getting lost, navigation errors and feedback from passengers.
• Review sedating medicines, alcohol use, sleep quality, vision and neurological symptoms.
• Consider a specialist off-road and on-road driving assessment when impairment is uncertain.
• Match advice to local conditions, including traffic density, road distance and transport access.
• Discuss practical alternatives before recommending cessation, such as family schedules, taxis or community transport.
• Document the reasoning, safety concerns, capacity for insight and relevant licensing obligations.

Research literacy also matters for clinicians interpreting emerging evidence. Australian practitioners can consult psychology research updates alongside professional guidance, provided that findings are applied cautiously to the individual rather than treated as automatic predictors of unsafe driving.

A compassionate assessment recognises that driving ability can change gradually and unevenly. Clear evidence, early conversations and tailored support can protect road users while helping older Australians maintain participation in everyday life for as long as safely possible.