My mom was always a bad driver, but worse with age. Living a few miles from their small town, it was difficult to take the keys away, as she was very much marooned at home during the day sans car. But she lived in a place with no traffic and few driving challenges. The police one day thought she was driving drunk, stopped her for a breathalyzer test, and when negative (she was mostly a teetotaler) took her home and told her she was never driving again. Such a relief, and I was so thankful.