Towards the end of his life my father was becoming a hazard behind the wheel of his big ole Cadillac. There was no talking to him about it. He passed away before harming himself or others ( a few dings on the Cadillac), and I had already decided that it was not my responsibility to control him. Fortunately, where I live in the Tucson area there is a robust shuttle system to transport seniors, disabled persons, and anyone else around. But beware during the winter when the elderly snowbirds arrive! I often have visions of my father then.