Driving would be dangerous. The individual is mentally and physically incapacitated. For example, what is seen is not comprehended. This can lead to serious accidents. Inattentive to external stimuli such as pedestrians or oncoming traffic.
Judgment is slow or poor in traffic situations.
Muscle control is weak and reflexes are too slow to react appropriately to traffic situations or hazards. The cognitive and physical abilities of drivers who have been diagnosed with moderate or severe dementia will have deteriorated to such an extent that driving would be unsafe, and their driving privilege will be revoked. Drivers with a medical diagnosis of moderate to severe dementia need no further testing because progression of the disease beyond the mild stage of dementia renders the person unsafe to drive. The driver will be expected to answer general questions such as name, address, or type of insurance, along with questions about the driver's health, medical treatment, driving record, need to drive, daily routine, and the need for assistance with daily activities. The knowledge test is used to determine the driver's mental competency, cognitive and language skills.