Abstract
Among the diseases associated with ageing, dementia has been the subject of extensive research because of its devastating effects on patients and their families, and the social and financial costs it places on the nation. Dementia can diminish the ability of the patient to perform complex activities that require ad hoc problem-solving skills. Automobile driving is such an activity. When friends or family are reluctant to intervene, physicians may be the last line of defence to protect the patient and the public. (A)