The Alzheimer's Association's warning signs of unsafe driving include the following (5): Forgetting how to locate familiar destinations Not obeying traffic signs Making slow or poor decisions while driving Driving at an inappropriate speed Becoming angry or confused while driving Hitting curbs Not keeping within lanes Making errors at intersections Confusing the gas and brake pedals Returning late from a routine drive Forgetting the destination during a drive Some impairments may obligate practitioners to refer a patient to the state Department of Motor Vehicles for additional testing or driving restrictions.