A diagnosis of dementia does not automatically mean that a person with dementia is unsafe to continue driving and different types of dementia impact brain function in different ways. However, eventually as the dementia progresses, they will have to stop driving because of worsening cognitive impairment. The more impaired their driving skills, the higher their risk of collision. Accordingly, facilitating driving cessation—including following your province's reporting requirements for medically-at risk drivers—is essential for keeping the person with dementia, their family, and the public safe. Educating the person with dementia and their family/friend carers about the relationship between dementia and driving risk is an important early step.
Older drivers are the fastest growing segment of licensed drivers. Although older drivers are often unfairly characterized by the media as unsafe to drive, the vast majority continue to be able to drive safely. However, research reveals that medical conditions such as dementia negatively impact driving behaviour and eventually result in unfitness to drive. For example, research investigating driving performance in people with dementia indicates that:
Common domains that can make driving with dementia unsafe are:
As a result, dementia can pose a hazard to safe driving. Accordingly, when taking the person with dementia’s history, consider the following additional warning signs:
Some people with mild dementia may be able to drive safely for a limited time before they must stop. However, the longer a person with dementia continues to drive after diagnosis, the higher their chance of getting into a collision. The majority of studies show an increased risk of motor vehicle collisions among people with dementia.
Research indicates that driving performance decreases with
increasing dementia severity (Jacobs et al., 2017). Two systematic reviews
found that in 17 out of 17 studies that used driver performance as an outcome measure,
drivers with dementia performed significantly worse than controls. Driving
performance was evaluated using road evaluations, driving simulators and
driving reports. In addition, in 6 out of 10 studies of caregiver and/or
state-reported motor vehicle collisions, drivers with dementia were involved in
a collision more often than controls. (Chee et al., 2017, Man-Son-Hing et al.,
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