23 May Driving and Parkinson’s
Driving a car is a powerful symbol of independence that is closely tied to a person’s self-esteem. Driving is a practical skill that allows us to get to and from work and is necessary to transport children and grandchildren. It can also allow us to visit friends and engage in other activities on our own time.
While the symptoms of Parkinson’s disease (PD) and the side effects of its medications may affect a person’s driving ability, the diagnosis alone does not mean the person with PD needs to stop driving immediately. Many people with PD continue to drive safely long after their diagnosis. The question of driving depends on specific symptoms, along with other changes that may come with aging.
The Impact of PD on Driving Skills
Driving is a complex task that can be impacted by other things going on, such as our physical, mental or emotional state.
It requires:
- Physical strength
- Visuospatial processing, or the ability to judgespace between cars
- Agility
- Good reaction times and reflexes
- Good hearing and eyesight
Ability to keep track of multiple things at onceMost people have perfected these skills over time and are able to automatically perform the complicated tasks needed for driving. However, the aging process affects driving skills, and several PD-related symptoms may impact driving ability:
Movement symptoms: Tremors and dyskinesias (abnormal movements that cannot be controlled) may make it difficult for people with Parkinson’s disease to get into the car, or to control it. Bradykinesia, or slowness of movement, can make it dangerous to drive, because driving often requires quick reaction time.
Cognitive changes: Changes in executive function (the ability to manage multiple tasks) and reduced ability to judge the distance between objects have the greatest impact on driving. People with PD may have difficulty multi-tasking — for example, driving while listening to the radio.Not being able to judge the distance between cars or the lines on the road can result in parking difficulties, misjudging turns, clipping side view mirrors, and misjudging the speed of other vehicles. This change in the ability to process what one is seeing, or visuospatial impairment, is one of the key reasons that passengers become concerned about a driver’s abilities. Lastly, memory difficulties may make it hard for people with PD to focus, particularly when you are driving in unfamiliar places.
Vision changes: People with PD may have trouble separating objects from their backgrounds, otherwise known as contrast sensitivity. This is particularly important at night, or when driving in fog or with glare. It may also be difficult for people with PD to visually scan the environment quickly enough to anticipate and react — for example, having to suddenly step on the brakes if a car ahead of you quickly changes lanes.
Drowsiness: Sleep difficulties and the side effects of medications can cause a person to become suddenly tired or sleepy. Research shows that sleepy drivers can be dangerous drivers, whether or not you have PD.
Are You a Safe Driver?
One way to find out how you are driving is to ask a trusted person to observe you at the wheel. Then review your own record. Have you had any crashes or near misses in the last year? Are other drivers honking their horns because your driving is unpredictable?
Signs that you should reconsider your driving:
• Dings on car
• Getting lost
• Attention/memory problems • Significant “off” periods
• Family concern
• Crashes
Testing Driving Skills
If you are having difficulty driving, talk to your doctor. You may want to complete a formal driving test.
Some tests may be taken in an office setting. These tests focus on visual abilities, ability to multi-task, speed of response, ability to maintain focused attention, and mental flexibility. Visual and motor reaction times are measured with computer tasks and physical activities, such as pressing down on a fake brake pedal when a red light comes on.
A more common option is to take a road test, with an instructor in the front seat and sometimes an occupational therapist in the back. The road test will include driving on large and small roads, making turns, and stopping at signs. And will evaluate your ability to maintain a steady speed and stay in the correct lane.
When to Give up Driving and Who Decides?
The decision to give up driving is much less well- defined than the decision to get a license. States and individual Departments of Motor Vehiclesvary in terms of how they handle license renewal for older drivers. Most people do not want to be told they can’t drive anymore. And no one wants to be the “bad guy” who tells a person that they are not driving safely. But if there are concerns, it is important to start these conversations early. The decision to stop driving can evolve over time, rather than being made suddenly.
A driving test can help you and your family make a decision about giving up driving while avoiding the tension that comes from involving loved ones.
Conclusion
The biggest challenge is finding the right balance: you do not want to deny yourself the privilege
of driving sooner than is necessary, but you do not want your driving to put yourself or others in harm’s way. All of these decisions can be less stressful if you plan ahead.