Of all the conversations families have to navigate after a dementia diagnosis, driving is often the hardest. It is not really a conversation about transportation. It is a conversation about independence, adulthood, and identity, and most people resist it fiercely.
It is also a conversation with real stakes on both sides. Taking away the keys too early strips someone of autonomy they may still be capable of exercising safely. Waiting too long puts them and others at genuine risk.
Here is what the research says about when driving becomes unsafe, and how families can approach the conversation.
What the Research Shows About Risk
The evidence on dementia and driving is more nuanced than the assumption that a diagnosis automatically means unsafe driving.
A systematic review examining driving safety in dementia found that drivers with even mild dementia were substantially more likely to fail on-road driving assessments than cognitively healthy drivers. That finding is consistent across the literature. On formal, structured evaluations, dementia impairs performance measurably even early in the disease.
The picture on actual crash risk has been less clear cut. The same review noted that evidence regarding motor vehicle crash risk has been inconsistent, constrained by methodological limitations in the underlying studies including grouping together people at different disease stages, limited differentiation by dementia type, and inadequate adjustment for how much people actually drive.
A population-based study published in the Journal of the American Geriatrics Society using linked data from Western Australia examined crash rates before and after dementia diagnosis. In the three years before diagnosis, 43% of the dementia group had a crash as the driver, compared to 30% in the comparison group. After diagnosis, crash risk dropped dramatically, largely because people stopped driving. The authors concluded that drivers may be at greatest risk in the period before diagnosis and in the earliest stages, when impairment exists but has not yet been recognized.
That finding is worth sitting with. The most dangerous window is often before anyone has identified the problem.
What Specifically Goes Wrong
A 2025 systematic review published in Alzheimer’s & Dementia by Hettiarachchige and colleagues examined which driving behaviors specifically differ in people with dementia. The researchers reviewed 26 studies using naturalistic driving data, driving simulators, and on-road tests, all comparing drivers with dementia to age-matched healthy controls.
Drivers with dementia showed greater variability in speed, more traffic light violations, more out-of-lane drifting, and greater variability in following distance compared to controls.
These findings map onto what dementia does to the brain. Driving requires sustained divided attention, rapid processing of visual information, spatial judgment, and executive function to handle unexpected situations. Speed variability reflects attention lapses. Out-of-lane drifting reflects impaired spatial tracking. Traffic light violations reflect failures of attention and reaction time. None of these require advanced disease to appear.
Warning Signs Families Should Watch For
The American Academy of Neurology practice parameter on driving risk in dementia, reaffirmed in 2025, identifies historical features associated with increased driving risk. Drawing on that guidance and the broader literature, the following are worth paying attention to.
Getting lost on familiar routes. This is one of the most significant indicators. Someone who cannot navigate to a destination they have driven to for years is showing spatial and memory impairment that directly affects driving safety.
Near misses and minor collisions. New dents and scrapes on the car, especially if the person cannot explain them, are a serious signal.
Traffic citations. A new pattern of tickets in someone with a previously clean record warrants attention.
Other drivers honking or reacting. Frequent horn-honking from other drivers suggests behavior that others perceive as unpredictable or unsafe.
Confusion between pedals, or delayed reactions. Any hesitation or error with basic vehicle control is significant.
Driving too slowly, or stopping inappropriately. Excessive caution can be as dangerous as speeding, and often reflects the person compensating for awareness that something is wrong.
Difficulty with left turns, merging, or intersections. These are the highest cognitive-demand driving situations and tend to degrade first.
Caregiver discomfort. If family members feel unsafe riding with the person, or would not allow grandchildren in the car, that instinct is worth taking seriously. Research on driving assessment has repeatedly found that caregiver concern is one of the more reliable predictors of unsafe driving.
Getting an Objective Assessment
One of the most useful things families can do is move the decision out of the family and into a clinical setting. This depersonalizes the conversation and produces a defensible answer.
Driver rehabilitation specialists. Occupational therapists with specialized certification in driving evaluation conduct comprehensive assessments including clinical testing and on-road evaluation. This is the gold standard. They can also sometimes recommend adaptations or restrictions, such as daytime-only driving or limiting to familiar routes, rather than a binary stop-or-continue decision.
Physician assessment. The person’s neurologist or primary care physician can evaluate driving capacity as part of clinical care and, in many states, can report concerns to the licensing authority.
State licensing evaluation. Most states have procedures for medical referral and re-evaluation of drivers. A study using Iowa Department of Transportation data found that drivers with dementia performed worse on nearly all evaluation tests and were denied licenses more frequently than other referred drivers. Notably, the study also found that drivers with dementia who passed the review and kept their licenses were not at increased crash risk compared to other referred drivers, suggesting the evaluation process does meaningful screening work.
Reporting laws vary significantly by state. Some states require physician reporting of conditions that may impair driving, others make it permissive, and some have no provision. It is worth knowing what applies where you live.
How to Have the Conversation
A few approaches work better than others.
Start early, before it is urgent. The best time to discuss driving is shortly after diagnosis, while the person still has capacity to participate meaningfully. Framing it as planning rather than confrontation lets the person have input into how it will be handled. Some families create a written agreement at this stage, where the person names someone they trust to tell them when it is time.
Focus on specific observations, not general capability. “You got lost coming back from the hardware store last week” is harder to dismiss than “I don’t think you should be driving anymore.” Specificity keeps the conversation grounded.
Let the clinician deliver the message. Many people accept a physician’s judgment more readily than a family member’s. Asking the doctor to raise it removes the family from the adversarial position.
Offer a real alternative. Loss of driving means loss of independence unless something replaces it. Having a concrete plan, whether that is rideshare accounts, family scheduling, senior transportation services, or a standing arrangement for errands, makes the loss more manageable and the conversation less like pure subtraction.
Expect it to take more than one conversation. Most families find this is a process rather than a single discussion. Anger and denial are common and do not necessarily mean the conversation failed.
When persuasion fails. If someone continues driving unsafely despite everything, families sometimes have to take more direct steps: removing keys, disabling the vehicle, selling the car, or reporting to the state licensing authority. These feel like betrayals and they are genuinely difficult, but the alternative is accepting real risk of serious harm to the person or to someone else.
The Honest Framing
There is no clean formula for when someone with dementia should stop driving. A study using Iowa transportation data noted directly that there is little guidance on exactly what point in disease progression warrants license restriction, because dementia varies so significantly in onset and progression.
What is clear is that driving ability declines as dementia progresses, that the decline is often not apparent to the person themselves, that formal assessment is more reliable than family judgment or self-report, and that the period around and just before diagnosis carries elevated risk precisely because the impairment has not yet been recognized.
For someone with moderate or advanced dementia, driving is not appropriate. For someone in the early stages, the answer depends on the individual, and that is exactly what a formal driving evaluation is designed to determine.
Driving difficulties reflect the same underlying cognitive changes that produce other dementia symptoms.
Our post on what dementia does to the brain explains the neuroscience behind spatial disorientation, attention problems, and slowed processing in plain language.
Have questions about memory care for a loved one?
We are happy to talk. Whether you are just starting to research your options or are further along in the process, reach out anytime.
463-444-9064 | Ben@HonorHavenSeniorLiving.com | Schedule a Tour
Sources
- Iverson DJ, Gronseth GS, Reger MA, Classen S, Dubinsky RM, Rizzo M. Practice parameter update: Evaluation and management of driving risk in dementia. Neurology. American Academy of Neurology. Reaffirmed February 2025.
- Hettiarachchige N, et al. Common driving behaviors in older adults with dementia: Insights from a systematic literature review. Alzheimer’s & Dementia. 2025;21(6):e70340.
- Driving safety in dementia: An updated systematic review of crash risk and driving impairment. Journal of Safety Research. 2026.
- Meuleners LB, Ng J, Chow K, Stevenson M. Motor Vehicle Crashes and Dementia: A Population-Based Study. Journal of the American Geriatrics Society. 2016;64(5):1039-1045.
- Peek-Asa C, et al. The Medical Referral Process and Motor-Vehicle Crash Risk for Drivers with Dementia. International Journal of Environmental Research and Public Health. 2020;17(22):8285.
- Alzheimer’s Association. 2025 Alzheimer’s Disease Facts and Figures. Alzheimer’s & Dementia. 2025.