Nationwide there are an estimated several hundred thousand licensed drivers with Alzheimer's disease. A new study shows that more than half can still pass a road test, leaving physicians to help patients and caregivers decide when it's time to stop driving. Dr. Donald Iverson, lead author of the American Academy of Neurology's most recent guidelines on driving and dementia, joins host Dr. Anthony Alessi to discuss what tests are available to help make this decision, and how to approach the delicate discussion of this loss of independence with Alzheimer's patients.