Let your parent's (or other family members') primary care physician know that you think he should stop driving but refuses to do so. Under privacy laws, a physician must have a patient's permission to share personal health information, so unless you have medical power of attorney, the physician won't be able to discuss his health status with you. But you can still write or telephone the physician and inform her that you believe your parent should stop driving and why. The physicians can examine him with this information in mind, and if she agrees with your assessment, may be willing to advise your parent to stop driving. (A number of states now require physicians to notify the Department of Motor Vehicles if a patient is diagnosed with Alzheimer's or another health condition that could affect driving safety.) If a family member's vision is compromised, you can also contact his eye doctor.